I think I found 2 bugs.

1. If you wait for too long to pick an item, eventually another item select menu will overlay on top of it and then you can pick from the new set. By doing this the player can bypass having to replace an item like armor with a version they didn't want.

2. On (maybe) the last stage, after a while enemies stopped showing up, waited 5 min and still nothing happened.

I've  got a massively huge bug for you it hurts my brain and eyes when everything does the flitter shimmery wavy BS please get rid of it and never ever do it again..... i cant comment on the game outside of this as i couldn't handle it at all and if your gonna keep it you need an EPILEPSY warning like an absolute must

Not sure if it's a bug, but after I beat the game, I got stuck on the end game screen.  I had to refresh the page to start a new run. Might be good to have a way to return to the start and play a new round after you win.