Really enjoying this and looking forward to the finished version! A couple changes I would suggest:
-Would be nice if the auto-map showed tiles that you can see through but not walk through. There are a couple other things it might be nice to see in the auto-map (e.g. health/armor/ammo, showing locked doors differently than regular doors) but the see-through walls are the main thing.
-Some of the stats shown in the level select screen (namely kill count, time, and efficiency) currently only display their values for the most recent run of the level. Would be nice to be able to see your *best* kills/time/efficiency either instead of or in addition to your most recent ones.
Also, I'm not sure if this is a bug or typo, or if I'm just doing something wrong, but I'm only able to play the first 3 levels even though the main page says this version contains 4 levels (there are 4 levels shown on the level select screen, but one of them remains locked even after I've completed the other 3).