I love this idea and it's fun!
Sadly, it looks like it froze during my first fight with something other than a goon. In case you get time to check on it, I'll give as much info as I can:
Tab, ESC, H, P, Space, arrow keys, etc. didn't appear to work at this point. I tried clicking in the game again, switching tabs/windows, and I had only activated the Fire Fists at that point, and I didn't see any animations for the ability either, though I'm not sure how relevant that might be to the game's freeze.
It may have something to do with the (Burning) Abomination, as I managed to get it to freeze again later with similar circumstances, though this time I backed off and used Ice Fists after my Fire Fists ran out:
I was using Firefox on Win10.
PS - I'm glad that I can just pick up with my character where I left off after reloading the page!