Artwork is adorable. Really like the music as well. Even the font is beautiful.

I like the idea that a pokemon battle is distilled down to a rps mechanic. What would be really interesting is if each "mon" had an animation tell that would infer which move they are about to throw. 

I regret to say, though, there's a rogue fifth color. I think the low health color (tan) and the character detail (red) were meant to be the same color, but they aren't.