The tutorial is great as well as is the art and sfx. I did not find any problems with using the "W" key for up and the controls were nice and responsive. Maybe I would move the healing key somewhere closer to like "Q". I had a problem with that the enemies will shoot me from a far distance even when I could not see them. I think it wold be smart to make them move towards me first or popping som "!" exclamation marks to the areas they are shooting from. Overall I enjoyed it even tho the theme did not really fit but if you and your team managed to do this in just 72 than hands down, (:
PS : Add some kind of "YOU HAVE BEEN KILLED" once the player dies.