The core gameplay idea is fun. However, I found the controls out of balance and it was unnecessarily difficult, unfortunately. I'd blame the arrows for that. I think that if we could use the mouse, only to aim around our character, it would be easier and really fun to play. To me, that would make a big difference !
The only other little things I'd personnally change for improvement :
-Less shaky camera when turrets shoot
-The double-button doors are a struggle with the arrows. But it would be great if the triangle would stay hooked to the door when pressing the second button, right now it's a bit surprising.
I feel like just doing those little things would make the game less frustrating and more fun to play !
Still, good job ! Looking forward to -if planned- future updates !