I like it a lot! Stylistically it's very striking; the character designs are all really nice. The aesthetic felt very cohesive and the characters' expressions and movements were incredibly dynamic.
The humor and tone really hit well and fit the style you were going for! The overly dramatic voice acting also worked incredibly here; it really helped to sell the world. Additionally the concept is really solid and has a lot of potential to expand; a supervillian school setting can go a lot of places both comedically and narratively, so that was a great choice of setting. Finally I really liked the protagonist; Spike was annoying in the best way possible, so great job on making him endearing!
In terms of things I wasn't too keen on, the animation was hit or miss; a great deal of it was very fluid and expressive but a bit was rough around the edges and could've used some cleanup and/or reworking. Additionally, a few pacing and dialogue/animation syncing issues held the short back a bit. (To your credit though, the pacing does improve as the toon goes on!)
Overall this was really nice, especially for your first toon! Great freakin' job!!!