As said, the webgl version is very laggy unfortunately. I like the mood of the game and the color concept, it's a pretty clever way to use "more" the given palette.
I don't like the combat system though, in a 1vs1 with a rat or whatever I feel like I can stand there forever shooting at him and the rat will shoot at me at the same rate so our bullets will collide forever without hitting us. Maybe I get it wrong and there is a easy method, but idk.
Overall it's a pretty game and I hope i'll see it finished one day. Great work :)