Wow, nice! Enjoyable fighting/waiting-for-opening mechanic - I like it.
Thanks very much! It's inspired by tough-as-nails permadeath games like the Binding of Isaac and Nuclear Throne, but with shooting transposed to melee combat. I've quite possibly over-done the difficulty level though, the mechanic isn't easy to master... although I guess that just means more kudos awaits the first person to beat the game and escape the dungeon!