Pretty neat dungeon crawler! At the moment, this game feels like it has a good core to it and would be great with some updates to add both some pizazz and more unique gameplay mechanics to it. Some random food for thought:
I'd like it if the different characters had some different powers to use to let the player decide how they'd like to approach the game. I feel like the combat is a bit lacking at the moment: could be a bit better if there was some sound, as well as letting the sprites bump each other to signify the attack. I didn't like the introduction of the X mechanic, which I assume is missing attacks, on the later floors: that feels like a more annoying form of luck that the player can't deal with skillfully. I was actually surprised that the game doesn't let an enemy attack you when you walk up to it without being evenly spaced: not sure if that's a good thing to let the player relax more or if it's a bad thing since it lets the player be lazy and not strategize their spacing.
Right now, this game's like a good, tasty scoop of ice cream, and I want some sprinkles and whipped cream on it! Definitely looking forward to seeing this built up!