I remember that game. I feel like more could be done with this concept.
I remember it, too. So glad Sega didn’t DMCA it like Nintendo did with Pokemon WG Version.
I was never a fan of platform games (apart from Imposible Mission on the Commodore 64… damn, that game was tough. Good though!), but this might have changed my mind 
If anyone’s interested in a similar mod for Sonic Mania, here’s are some links to Amy XL:
Sonic Mania Plus ver.: [NSFW] Amy Mania XL Plus [Sonic Mania] [Mods]
Sonic Mania vanilla: Amy Non Plus by Eishiban on DeviantArt
It doesn’t feature weight gain like the hack of sonic 2 does (just one static size), but it is very well done.
Nice. Maybe someone could make a Sonic 1 XL ROM Hack one day…
Oh, that reminds me that someone is working on a Sonic Mania XL hack.
id rather have a sonic 3 xl with tails