Random stats, and having the ability to control the difficulty is a very nice addition. The room transition does seem a bit.. strange, as you have to continue walking offscreen for a little while before you actually transition to another room.
One pretty large issue that I found is that the boss replays its death animation over and over (infinitely). And the boss also infinitely spawns health potions. The boss's hitbox is also enabled during this and allows for the player to push the "dead" boss around.
yes, those are actual *pickup-able* health potions, not just an infinite number of sprites.
Sorry if you already knew these bugs existed, just thought that it should be brought to attention, in case that you wish to fix or update your project in the future.