Really cool concept and art style, and the music was groovy! I had a really hard time progressing because sometimes when I tried to jump, he would kind of just "stutter" and fall off the edge. I initially thought maybe you had coded it for varying jump heights (so you can tap the spacebar for a short jump, and hold the spacebar for a high jump), but it didn't seem to make any difference. Figure that one issue out and I think you've got a great game, definitely awesome for your first game.