Alright I have an updated version
https://bin.smwcentral.net/u/49222/SilencioTest.bps
Here's what I changed:
Fixed the Yoshi cheese in the One Eyed Jack's secret exit and also slightly changed the disco shell part in the normal exit.
Replaced the thwomp in the Boxes Inside Boxes reznor fight with podobos.
Changed the ending of Cosmic Flashlight part 1
Made slight adjustments to the level No Hay Banda
Added a one screen room in the level Nonexistent with a message box that informs the player about the disabled spinjump.
No more up-pipe ending to the first part of Beyond The Fire.
Final level is now considerably easier. The first half is pretty much the same but more forgiving and less tight.
The second half is now much easier, shorter and less tight.
I also adjusted a couple of palettes and there are a few new music tracks and backgrounds.
The missing on/off switch sound happens everytime something hits it from the side, that's just how this custom block behaves but I don't think it's a big problem.
Also, in this test file I've made it so you can access all the levels right away, so you don't have to play through the whole hack again and can look at whatever you want!