First of all, thanks for playing my game! The heartbeat puzzle will be reworked since the first 2 are pretty similar, and I plan to change the X on the vault puzzle to Nº or something else to make it apparent that it means the 'amount' of green.
The Monika thing isn't actually a bug, but her dialogues circle back to the same ones in case you missed them, you have to choose between the options with the arrow keys and appropiate mouse control was not integrated since I didn't have enough time (I'll put it in the updated version).
I was planning to do WAY more with the story and Nyx since Room 4 was supposed to be entirely different, and I was also planning to add a Room 5, but I didn't have enough time and the game got stuck in a limbo :<
Again, thank you so much for playing my game! I hope you can see the completed version when I get it out :D