Hello! I'm S1Z2 and i have done a complete overview of your hack, things i liked and didn't like. I hope you enjoy the review!
Let's start off with the obvious:
In almost every level, there is something blocking the end screen when completing a level:
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Also in some levels the Palette for the "Mario" Text at the end is different compered to others:
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Every level that has the castle at the start is acting "off" when mario touches the blocks. This can be fixed by double clicking on that block while Map16 is open, and setting it's priority to "off".
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Weirdly colored blocks at the end of the level.
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From World 2 onward there are these weird pipes coming from the top of the level. Is this a way of preventing flying through the level? If so, not a bad idea.
Now,i will list every level in order. if i leave out the level, it's completely free of flaws.
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Cutscenes:
In the cutscene where peach's letter is shown,"something" is misspelled into "soming". I especially loved the "Please come to castle" Line, not hers, but some other castle.
There is a lack of the ' symbol when typing in the word "there's"
Small letter N when Kamek says: "No cake today"
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Tutorial Level:
Hit "B" to jump, not press, hit.
Spin jumping with the item isn't used in this version.
Sprites misspelled as Spires multiple times in the tutorial level.
The 1FO blocks and Mario Blocks aren't used in this version either.
Missing ' Symbol at "can't"
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Intro Level:
"Mario has sent to a far away island" instead of has, there should be a was.
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Let's get going:
The "bushes" on the grass semi-solid platforms are really misleading. Make them look less like a platform and more like a bush.
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Classic Cave:
On my first playthrough, the key was an odd white/pink color, but through my second playthrough the key was fully pink. No clue why this is a thing but i won't judge.
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Sunset Valley:
The first goomba on the goomba tower cannot be killed with a fireball, but the rest can.
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Beachside Castle:
This weird clipping issue.
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Eastern Islands:
But really, why is the secret exit's event taking so long, and why is it so OP?
Fish passes through Mario on the overworld after completing the normal exit.
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Hammer Brothers!:
This is my personal problem, and nothing to do with the level, but the music really doesn't fit with the aesthetic of the level.
If you have yoshi and you enter the sub area, the right side is a softlock (for yoshi, as the player can walljump)
Entering and leaving the sub area completes the level?!
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Toad's House 2?:
The second toad house doesn't have a name.
Entering the house with yoshi make you lose yoshi to exit it. (If big Mario)
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Lake Adventure:
This HAS to be my favorite level, the music, the level design, everything is perfect.
While driving the submarine, if you have a fireflower, you will shot mini torpedos AND fireballs.
Shooting too many mini torpedos can cause lag.
Shooting the blocks with coins too fast can make the submarine invisible.
The first time i played this level, i died at the submarine section because of Torpedo Teds. The 3rd Torpedo launcher is really unfair for big mario.
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Dolphins!!:
Dolphins going through the ground isn't really the most realistic thing ever..
After completing the secret exit, the top right of the screen gains 3 black tiles for some reason.
Also you made 4 almost complete worlds, but not the yellow switch palace...
Landing on a Koopa with the cape makes it invisible, only in this level.
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Eastern Caves:
The "Piano" Music starts playing after exiting the cave for some reason.
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Nippers and Chomps:
In my first playthrough, i crashed at the middle of the level for some reason.
If you're a big mario on a yoshi, you'll crouch while entering the level.
Exiting out of solid walls
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Donut Castle:
The Boss door is actually a normal door, while the normal door leads to the boss
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Rocky Hills:
That Sub area took a little while to find.
The top half of the pipe is missing at the leftmost side of the screen:
I have no idea why this happened.
The Secret Exit event is... weird. (Also the Edit Later. Toad house)
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Bast to the Past:
Did you mean Blast to the Past?
The Bob-ombs are REALLY out of place in this level, as well as blue koopas and flying spinies.
This Useless water.
Hitting certain questions blocks make the animation of hitting a brick block.
The Flag is on the wrong side of the flagpole.
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Long ? Blocks?:
Confusing name?
By far the worst level end screen.
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Balloon Ride:
Most of this level can be cheesed with the cape feather.
If you keep holding to the balloon after completing the level, mario will go offscreen and die.
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Mountain Forest:
So, The whole world is chocolate colored, but this level isn't?
The red berries have a black outline, but the pink berries have a grey outline.
Mario does the pose behind the big tree, also the tree blocks the end screen text.
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Classic Airship:
The level is a little long, but it's an airship so it's acceptable.
I have no words to what happened here:
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High Line Fish Line:
Another weird level name.
If you get eaten by the Big fish with yoshi, Yoshi will at first disappear but when the retry option comes up, yoshi will reappear.
The part with turn blocks where you hit them all with the koopa shell lags, alot.
Near the end of the level where you spin jump on giant turn blocks also lags a lot.
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Last but not least, Goomba Valley:
After killing the Huge Goomba, 2 invisible "things" spawn.
Eating the pink berry with yoshi makes this happen.
I get it, the level isn't finished yet, but why leave it like this?
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Things i liked:
The Cutscenes are really good looking and interesting to watch, the story got me hooked for more.
The look of the Classic Cave is really detailed and interesting.
The Scrolling Layer 3 clouds. I really like them.
The Toad Houses have really cool minigames.
The Goggles on the cape powerup look really cool.
The LETS-A GO! at the bottom of the overworld screen is a nice touch.
OMG, THE SUBMARINE IS SO COOL!!
I liked the wind effects on world 3
Transparent water at High Line Fish Line is really interesting.
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Things i didn't like:
The animation of the checkpoints being glitched, there is a gfx fix for this
here.
I have no clue if the pink cape is an artistic choice or a bug. Anyway i personally don't like it.
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Overall opinion:
Amazing hack! I really enjoyed every level and subarea i could find. I think the story is really interesting.
This hack has a lot of potential and i would like to test the next version when it comes out.
That's all from me.
Best of Wishes, S1Z2
PS: You misspelled ROM hack on your original post.