Nice polished game ! lots of mecanics are working great and neat graphics but it is a shame it as no tutorial nor win condition or scoring.
Way to improve :
- A tutorial ! Even an explanation of the controls in your game page would be better than nothing, it took me a while to figure out the controls !
- See the player and walls border through walls at least with a small transparency
- being able to shoot and or having loot of health or bonuses