Awesome game guys! Great concept, art and music. Though, the controls were a bit unconventional for me.
(spoilers ahead) I found the level with the aliens to be very difficult. You also can't attack while in the air and don't take damage when standing on top of an enemy. I replayed the level with the monsters and thought that I saw the evidence items. However, this was not the correct answer. I guess that all of the items have to be present, but I didn't notice them in the other levels.