Very precise and enjoyable graphics ! Playability wise, you should use a smaller mask for the player, so you do not get the impression of sticking to walls, or a round mask. You could also stick the player movement to a grid. There should be a possibility to gain more time, and maybe to play faster (what about a dash move to go to the sleeping guys faster). I like the idea of waking up the cute little guys, that's a nice use of the theme that could give a lot of gameplay :)