This is a very well-made game. I like how open-ended the levels are as a principle, and you have found lots of nice ways of adding encounter variety to the maps in natural-looking ways. The low-poly artstyle is smart and seems very much deliberate in giving just enough context that the locales are properly contextualized without making them look awkward when they are designed in a way that may appear a little bit unreal.
My main problem with the game at the moment is that I found the best way to play when I haven't yet memorized the map to be to just prance around and not engage the enemies a whole lot, which is boring. And even though I like how the keycard system just barely helps in punishing that a little bit, it feels like a bit of a crutch with how hard it bottlenecks progression. Maybe there could be some mobility resource that's tied to killing enemies? IDK just ideasguying solutions here