Thanks man, appreciate the feedback. Ill try experimenting with bigger boom sound. The advice on the upgrade seems cool, putting the level 1 upgrade at the start would be a teaching moment and also maybe make the run more random (like slay the spire relics).
Currently Up and Down button also works but yeah, we gamers need our WASD. Ill try to implement it in the next version. Thanks again for the feedback. I wish my game looks as polished as yours.