I really like the concept! I love how the player sometimes pauses and you have to watch him heal up, shows how awkward it is to wait for that from teh enemies' point of view XD I also really like how in the second level, playing as 2 enemies is more firepower but less control, so when one of them dies you gain control at the expense of firepower. and I love the different kinds of enemies. all in all nicely done and well balanced!!!
As a piece of feedback I would say the art needs a bit more polish.
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