Same issue. It seems like the level-up/shop menu just stutters and disappears, along with the game itself freezing. If you click where the skip or confirm button or whatever is supposed to be it unfreezes, but kinda hard to play a ROGUELIKE where I CANNOT SEE my OPTIONS/UPGRADES. Not a minor oversight, it renders the game non-functional. I tried launching through the Itch app, and the web version - same issue on both.