Very good game controls and mechanic.
Nicely rigged character. I would be interested in seeing your walk animation or code.
Too many keys to learn posed a bit of problem for me, since I'm not an avid player. Should be no problem for experienced players, though.
Time slowdown is a bit overpowered. I can just slow time, fire 50 laser shots in the direction of enemies, then release the time. The batch of laser pulses destroy all enemies in that direction. This stategy alliviated the need for the more advanced gravity manipulation / teleport tactics in battle.