Bruh this character is broken because there are too many rings in every stage (still use the abilities that cost 5-10 rings wisely). That's what I love about this mod.
I'm not trying to break rule 15, but I wanna see if you can make him compatible with XMomentum.
Really fun character! The ring mechanics fit right into the flow of gameplay. I especially like how the ring consuming abilities don't require the full amount, and instead just take what you have if you can't pay the cost. The ring drain reaches a nice middle ground where its something you need to keep in mind, but rarely forces you to stop in your tracks to gather more if you're managing it properly.
The lack of original sprites kind of make this a hard sell, though. You don't even have to make a full new sheet; a few accessories and adjustments here and there to solidify the ring theming would do wonders to make this character stand out more.
All in all, GMS may just be a new favorite of mine. I'm definitely loading him up next time I play a level wad.
Rings-as-cost is usually a tricky thing to get right, because you risk making your character too weak without rings, or being stuck grabbing everything to get basic moves out. I feel this mod does a good job at not being too taxing on your ring costs, and his natural magnetism makes collecting rings in groups much easier. He may be weaker without rings, but slow fall is a decent enough ability on its own, so you're not left in too bad of a state when dry.
I also like just how cranked he gets when you turn on your rung consumption, as it feels like a real gear shift. You have incredible power at that cost, and you are in full control of it. And with Overdrive on, you can just splurge on your moves, it feels pretty darn good! My only real issue is that your ring consuming flight uses the BASH flight sound, which is SO obnoxious to listen to for this long. There's a reason why the normal Metal Sonic's hover is silent. If you can't find something less loud to use, I'd rather it be silent too.
While I think the mod is good, it doesn't go much higher than that for me. It takes a lot to use a character mod that's an alt form of an existing character with recolored sprites, and this one is not really something I can find myself going back to. But I still had fun with it!