There's this one Sonic fan game that has been sitting on my hard drive for a while now called Sonic Before the Sequel, a prequel to the events of Sonic the Hedgehog 2. From the little I have played already, it's quite the fun little gem that keeps the Genesis-era Sonic spirit alive as SEGA continues to tweak the hedgehog for modern platforms -- 15 years since Sonic Adventure and only now starting to get the hang of the third dimension.
A couple weeks ago, Before the Sequel developer LakeFeperd released a follow-up entitled Sonic After the Sequel, which obviously chronicles the events immediately following Sonic 2. If you are itching for that sweet 2D Sonic nectar and can't quite stomach the changes Dimps made to the formula in recent years, you need not look any further.
But the big highlight of this project, and what elevates it to god tier, is the game's absolutely insane original soundtrack available for standalone download here. Ignore the music in the trailer above, which has been pulled directly from Sonic CD. The real thing, which also includes remixes from past Sonic titles, is simply indescribable. I don't think you can truly understand how good it is without a few samples, so I've taken the liberty of posting some samples below. Enjoy!