Level design looks fairly good, and I like the idea of it as well. We'll just have to wait until we see more.
Pretty good level overall, though I have some complaints.
Please don't put grass at the bottom of the level like you did here and in a couple of other spots. It's very misleading.
-Rex head for a switch tile.
-Palette ugliness on the message box (same with earlier in the level too, for that matter.
This is a very difficult jump.
-No screenshot, but at the very end of the corridor in the above screenshot is an SMWC coin .. but I don't know where to go after that. I thought a goal roulette might be there, but one didn't pop up. Am I missing something?
-No screenshot, but I agree with Bloop. If you could speed up the spawn rate of those balloons, that would be grand.
It should probably be noted that I don't really agree with your extreme usage of munchers either, especially in the second half. In fact, I feel that some parts of the second half are a little weak compared to the rest of the level. I'd kind of like to see more usage out of those balloons, and less random muncher jumps.
Other than that, good stuff. Try to fix up everything I listed above and you should be good to go.