The voice acting is indeed funny, and the graphics is well done.
My gripes are mostly mentioned in the other comments. The thing I’d like to add is that I would like some explanation of what the spells do. Some are easy to understand (fireball, dash, the Japanese one), some I still don’t get (such as the Tracer’s ability, I’ve never played Overwatch so I have no idea).
I’d also suggest adding the movement/aim tips to the game page as a last resort, because I had to look for them in the comments.
As a minor complaint, in my personal opinion the music didn’t really match the wizard casting spells vibe. It felt more shooter-y or speed platformer-y.
The narrative is quite smart, really holds the concept together though. Good job on that!