Even on easy mode, this game is not easy. And even after several "speed increases", sonic still feels hella slow to me. Even holding down ZR isn't much of a "boost". The game lacks serious speed, and it makes me sad. The glitchy effects hide the frame rate well though.
I found it on one of the usual switch ROM websites, easy-peasy. But it was an XCI that didn't work for me, so I converted it to NSP myself and that installed fine.