The atmosphere is really great and the game as a whole feels really polished. The first part could be a little more generous but it's not really that important. I almost feel like you move too fast while preparing to jump, but that might just be me. For the long jump it's a little hard to see the actual area you're jumping over so it's hard to time it right and it felt a little unfair when I died there. Those are just nitpicks though, and overall a really great experience.
Of course when I have time I'll come back and try to hack the leaderboard XD