I made a post-compo version of my entry, with modifications suggested by commenters:

• added sound effects
• added music (ambient sounds, actually)
• small fixes in walking animation
• small fixes in gfx: exit doors became orange/red, also you see part of the room when the door is open
• gameplay fixes: player health was replenished at the start of a level, now it is maintained through the game

You can play it here. If you want to rate it, here is the original compo entry. Enjoy!

Thanks to  CplMustard,  merthsoft,  jfroco, dr_soda, Thomas, Benjamin for their insightful suggestions!

Tags: extended, Flixel, game, post-compo