Thanks for playing our game! I'm happy that you enjoyed it! This was our first jam after 7 months of game development so yes, sadly there some bugs. The levers actually do something, you need to trigger them in a certain pattern to open the door. The unkillable boss is my biggest regret because we never play tested it properly (we have playtested a lot but i was too lazy to kill the boss so i just set his hp to 0 through a script to see if the wall behind him opens).
I've already fixed crap ton of bugs, even the bugs you are mentioning. We will release the fixed version as soon as the judging period ends ofc.