GAMEPLAY: I have no idea how to play this. I'm told I can eventually pick up items from enemies, and I have to assume a door opens at some point, but I hardly get out the first room before I'm sniped by a sawblade or whathaveyou or run out of bullets. Skill issue, most likely.
VISUALS: I'm reminded of a lot of Flash games I loved--I think VVVVVV is one people recognize. Very, very simple, but with the combined atmosphere, it's a somewhat quirky experience that holds together well. Very intrigued by the shuffling letters used for the menu.
AUDIO: I was hoping for music to kick in after the first screen, but alas. The jump sound effect fits the 'quirkiness' I mentioned.
THEME: You say this comes from the enemies dropping items. I'll have to take your word on it.