Thanks for playing. I did have the doors opening/toggling automatically, but wanted to add the jeopardy of having to press a key (I also played with auto-close as well (especially when you are trying to escape) - but I would need to allow the ability to interrupt a closing and allow the player to open again.
I had/have a 'collect' coins mechanic as you walked around, as well as having to 'collect' your next set of cards before you can use them, but to be honest, with the random tile selection and the 'random-ness' of a player placing the tiles, that will take a lot of time to balance correctly and so I just allowed the player to request more cards/tiles at any time and it auto fills when down to the last one too...
I really enjoyed working in 3d and exploring the procedural generation side of things.
Thanks again for playing.