When the doors fall onto the board, putting more coins onto that side will push the door that you want to go into down, but that isn't explained well in the game and I will get that fixed as part of the after jam updates! Thanks for playing and I'm glad you thought it was satisfying and fun to play!
The decision making process is something I really struggled with and I think a lot of balancing needs to be done to make the choices feel more impactful as you go through the floors in the Adventure game mode. It was something I personally struggled with in the time frame.