Wow, great ambience and gameplay! Here's my little feedback dump:
- I would have preferred the walls not to have the small little tips which made it a bit hard to move around (me problem :P)
- It was a nice challenge, I think it would be good to see some more glowing markers on what walls have been shattered.
- I also found my game to stutter/load for a moment upon seeing something new, I just had this issue myself and figured out myself how to preload and warm up those graphics because openGL is doing it's best!
But overall no complaints and I had a great time! Excellent work