Wow. It's been so long, hasn't it...? This is PRETTY badly made. Enjoy. Also subscribe to YuB. Version 1.0: I just fixed a Ceiling Collapse (Bone stab) glitch. Dunno how it happened, but I sure don't care. I also added sounds to the attacks.
TheConstructer made an amazing level editor, and I hope you check it out! I got the sprites/sounds from pococikapusta's Undertale Simple Battle Creator. So, yeah.