Really awesome visuals in this game, it looks gorgeous to play!
I think the locked rooms mechanic was a little dull - I much preferred the gameplay when I was charging through the enemies and beating 'em down, rather than when I was waiting for new enemies to spawn while locked in a room, heh. Also, it felt like the enemies took too many hits to die - it probably would have been a more satisfying experience with a higher enemy count and lower hp per enemy.
But all in all, I had a lot of fun playing. Great work!