This was very fun. I love the puzzles you cam up with using this mechanic, and once you get the hang of them it's very enjoyable to form a plan and then be able to execute on it. That being said, I have a few critiques:
1) Something when you gain the abilities to let you know, I walked into the first guy for almost a minute before realizing I could now jump.
2) Sometimes the character wouldn't jump when I hit space, although the other abilities worked all the time.