Pretty neat! I liked the variety of enemies and the upgrades seemed reasonably powerful! My only gripe is that is that it would be nice for the player to be able to see what's behind each door without having to go up to it each time. It could be nice to also give the player one of each door (enemy A, enemy B, shop) each room so that they always have the option to spend money. I ended up with a lot of extra currency when I really wanted to spend it to get more powerful. Good job!!