it's pretty tough, but nice! i found it strange, that when you die the first time without saving (i actually missed the hint to press c) that the game just exits. the other thing i encountered was the crate, the purple guy said it'll crush snails, but they just jump over it. i lol'd, because i've never seen jumping snails ;)
two other quirks came up with sound. first, the background music restarts over and over, when entering, either by proceeding or dying. it should just play. the second issue is the jumping sound of the hero which i didn't like that much. it would be cool to have several jumping sounds.