In my opinion, the "gritty reboot", or in this case, reimagining, is a tad overdone these days, but you managed to pull it off alright.
The animation for the most part was pretty solid, although there was too much shearing, or whatever it's called in Flash. The radial in Bowser's face was another aesthetic flaw I couldn't seem to get over.
I do love how you portrayed Toad, however. He went from being a completely useless cunt that you accidentally saved to a supporting character of actual personality and use.
Mario looked like a Goron. Intentional? Either way it's pretty cool.
Anyway yeah it's pretty good overall.