My wife and I saw it last week, and we both enjoyed it. As I've said before we watched the first one on streaming a while ago because, enh, why not, nothing better was on and it was surprisingly not bad.
I've never been into the Sonic games so don't know a lot of the lore but...
Spoiler
Show
Super Saiyan Sonic? Is that something from the video games?
100% yes.
Spoiler
Show
Get all 7 Chaos Emeralds and you go SUPER SONIC!
Happened in Sonic 2, 3, &Knuckles, Adventure One, Adventure Two, '06...