Wall Walky Thingy

Looking for some feedback on this little game prototype. You can walk on the walls and ceiling (the areas where you can do this are tinted black) but if you stay up there for too long you will run out of magnetism, so you need to collect magnet packs i spread across the arena. And the only place you can get health is the ceiling. A few minor details, the revolver is a 1 hit ko but takes a while to reload, the rifle can reload quick but takes more effort to kill an enemy and the shotgun never has...