Really good concept but weird AI
Gameplay:
The concept is really promising and well executed. Controls are really smooth until there are too many ghost AIs following you. I assume coding of AI is only "follow the player" code. You can fix it by adding NavMeshAgent 2D unoffical plugin to Unity. You can find more details in web.
Sounds and Graphics:
I really liked the polish of the visuals. I really liked the shadows and lighting. It gives me Hotline Miami vibe.
Same for the sound effects, they are really good. But I think background music blocks other SFXs a bit. Like walking sounds, ghost (AI) picking.
UI:
UI is simple, working perfectly except Quit option on WebGl, I assume you forgot to remove it, but this is not a problem. Another little issue that I found there's no restart option. I just want to reload the scene, I don't want to go back to Main Menu and click another Play button. But as I said, it's not a problem.
Nitpicking, Glitches and Ideas for Improvement:
I read the comments and I don't want to go too deep but as you know there is critical glitch between horde of AIs and Player. It should need to be fix.
Another idea for improvement is you can add counter to doors. Like 7/11 AIs picked. So I can understand should I go back and search a room one more time or should I try to bump into the door.