These are ULTRAKILL bosses in an Undertale style. It's not perfect, and it may look funky, but it is still a funplay! use the arrow keys to move, and use Z to select. Those are the only buttons you need! For ACT and ITEM, click the option with you mouse, I got kinda confused as to why it wont work, so just click it.
Credit to ULTRAKILL for the bosses. And credit to Undertale for the style of combat. Some bosses have different heart modes than just the red.
