Nice short funny game there!
What I enjoyed about it: bunch of references, clear explanation of rules in the beginning, nostalgic MS Paint art style, challenging battle
Things that could be improved: music is missing (guess there is supposed to be some, from credits), buttons like "OK HONKER" have trigger zone not covering the whole size of button, no goose cursor displaying, I was able cheating with battle by moving cursor before full slide load, but really that is more related to PowerPoint itself, also attack sprites seem preloading a kind so I was hit before seeing the attack coming( played with PowerPoint 2007)
Bonus point: free assets yay!
Good job, keep it going!