This is SUPER NEAT. It gives me a lot of PS1-era vibes being a puzzle-platformer of sorts with a touch of Q-Bert like "paint the ground to clear the level" mechanics. I like that you don't have to paint all of the ground the correct color to win either, just a percentage of it. The level designs are also quite unusual thus far so a lot of levels don't feel like one another in the demo, and the item and enemy variety so far is decent too.
I'd totally love to see more for this game in the future. What's in the current demo is already promising.
Just one thing I ran into while trying to play the game: I got a Red Bomb powerup of some kind on the sixth stage, which I'm guessing was meant to destroy all enemies on screen on use, but when I used it, the game crashed.