Visually, this is charming in its own way--mechanically less so. I'm uncertain whether certain things are intentionally trolly or not. The platforming sections probably feel the most cohesive. Once I figured out how some of the slimes were moving, I could see some good ideas there, but I'd recommend focusing in on those sections more and maybe doing something with them in a different visual style.
The game is probably hard enough without using the intended touch controls. I was able to play with a keyboard and mouse and I might not have finished this otherwise, as I suspect it made shooting sections in particular much easier.