Nice props. I think the filling pattern should be random instead of filling from bottom, currently the only thing we should do is to stay at top of the room.
It's too dark, I can't see my surroundings and there is no hint for new users in the game, but I think the idea is good enough. Using the concept of time gives you great flexibility for game design.
I opened all the doors and I exploded every time, also I struggled with collectables too much. I suggest that make your game fun to play first then use art and models to make it even better.
I don't know what is the scale of the game in your mind but I think your game can be more like a game that I played 15 years ago "Still Life". Watch the gameplay it may inspire you in some ways.