Nice game you've made here. Gameplay and controls are intuitive, and the menus are accessible but not in the way.

Some observations. I had reached all my max levels on the 4th floor. After that point, I stunned enemies and walked by them. There was no real incentive to kill them.

Also, and this mainly happened when I reloaded the game after having closed the browser, monsters respawned on top of me, leading to an immediate attack. Getting killed by a Necromagus right as you're getting into it was a little wacky.