This was a great romp! The art was charming, the music was catchy and invigorating, and the concept was a clever use of the theme! I played some last night, but got a bit stuck because of screen resolution issues and ran out of time. Came back to it this morning and the controls felt more natural, so I can see how a bigger game could feel good.
It seems like there's some glitch that I noticed in the screen farthest to the right(and in other screens after) where if you turn to liquid in the water shafts, you'll fall through the floor/float through the ceiling and end up "stuck" in the floor. The player can still move but stuck within the boundaries of the floor art. Interestingly, you can also jump into the blocks that stop the cone enemies, and then turn liquid to drop back out of them, and it worked as an exploit to cheese that last screen beyond the dash lightning trap. But it did also make me have to restart other screens a couple times. I think it might have something to do with being tiny mass/density when turning liquid because it didn't seem to be an issue after I changed to big again.
Anyway, fun concept, good entry, great job!