What I liked in particular about your game was the bounciness effect(bouncing off walls, off platforms). I also thought the textures you add to the platforms also worked well in fitting with the theme of the game.
In regards to what could be improved, I do think some of the platforms are placed in ways where the gaps in between are a little small. I found myself hitting the edge of the platforms and falling back down when trying to jump between the gaps. I think if you moved the platforms a little more farther away from each other that would open up a little more room for the player to jump between them.
Overall I enjoyed how the player bounced up and down after landing on a platform, and I liked how when the player was on the blue platforms, the bounciness got progressively more & more intense. Lastly I thought adding eyes to the character was neat as it brought it to life in a sense. The character sort of reminded me of slimes in Minecraft(the blue platforms also reminded me of slime blocks due to similar mechanics).