I'll kick off with the positives.
Good music, the special stage especially slaps plus we've also got a Sonic Rush stage so tunes are here.

It's nice that they decided to pluck different stages from across the Sonic catalogue for this version compared to the console version.

That's it though, otherwise this game is mostly a shiter.

The choice of levels are mostly worse, the two versions of Sonic play too similarly especially because they give Classic Sonic the Adventure (onwards) homing style attack.

So many checkpoints are made so that without going a little back or a boost you can't actually make the next jump or you walk straight into something.
Added to this is that the hit registry is not very precise.

I was glad to not have all the mini games the console version had because a lot were crap but having nothing makes this game feel very bare bones.
I've been playing Game Gear Sonic games recently and this doesn't have much more content than them.

Oh also I ended up skipping the cutscenes because the basic nature of them made them extremely boring, it's not as if the dialogue was ever strong but when that's all you've got... no thank you.