Graphics are simple but with the help of shadow and some chromatic aberration it looks very nice. Your music is great too. The controls have some issues (perhaps due to lags). I was rarely able to double-jump. I didn't manage too complete level 1 (witch even if I'm a bad platformer player, means it's too hard for a 1st level). Though I think your idea is clever ! Have to plan all to complete the level using mutation specificity, that's great !
Edit: Would make an excelent game to speedrun.