It reminded me of Bungie's older games, particularly Abuse. The graphics were detailed, gritty, and overall very well done. You could definitely do artwork for commercial games if you wanted. The gameplay was a good mix of straightforward platformer/shooter action and RPG-ish upgrading. It was challenging but not too hard (although I gave up during level 3). If you're looking for ways to improve it, I'd say push the graphics even further. Create unique backgrounds instead of tiles, and maybe scale things up to show off those nice sprites. I also would have prefered side-scrolling instead of a one-room-at-a-time-based system. Overall good work; hope there's a sequel.