Way cool! I love that switching worlds on the main menu shows the credits. In general, I think your initial presentation of the game is excellent. I also really like the mechanics and level design in general! My only two critiques would be: I don't look at a dead plant and think "I can probably bounce on that," and I'm really not so sure about that water sound effect you used.
But I like the look and feel of it a lot. Nice music you made, too! Super impressive overall!