Mono Playground
As shown in the video, the game is called Mono Playground! It's gameplay is inspired by the Sonic the Hedgehog gameplay, though plays a bit differently in comparison--I'd say my version is bit more floaty and obviously has a lot less levels and content. I'm in the process of trying to get it released for free on Steam--mostly for the learning experience--but it's going to be a while before the process is complete. For those who are interested right now, you can view the source code and play a release from the GitHub.