I like the game! Here are some suggestions I have:
Can you make it so that there is something like a monster encyclopedia and after we see a monster and go to a new depth, we have it's movement pattern charted? Because I was confused when I first saw monsters. It would be nice if there was some sort of defense mechanism. Can you make it so that monsters after to stop one square before their max before they can attack? Because I can't past that first monster due to that. Can you make upgrades permanent, at least for that run? Because I keep getting pinned by the floating head.