Aw man, I download these things to play games, not be prompted to make one and remember I have one I need to hurry up on!
I was never any good with these sorts of 'make your own puzzles' type games, so I'm too much of a brainlet to extensively play around with it. Slime physics are neat, though simplified compared to something like Gish, which might limit weird non-Newtonian puzzle possibilities.
I also ran into a bug where I couldn't move the editor around until I cleared a level. Zooming the map out (if it isn't possible already, might be related to the former bug) would also be nice.
Also, putting a big price tag on this thing at such an early state's not a good look. Take that shit to Patreon, you'll get more traffic that way anyway.