Really cool idea for a mechanic! I had a hard time understanding how to advance past the opening though, because there wasn't any way to get past the first snake enemy. Eventualy I realized that it seems like you can spawn a platform using the paintbrush, stand on top, and get yourself to the end of every level just by doing that.
I'd love to see the paint gun mechanic utilized more from the beginning of the game, because you have a really cool mechanic built but the game never seems to make me make use of it.
I actually recorded my playthrough. If you want to see my impressions as I played, you can see it below (timestamp for your game in the description). Hope that can be useful!