... Not THAT bad?
Just pretty damn slow. That's really the biggest problem with the game, you HAVE to use the spindash to move around, otherwise you're not going anywhere anytime soon. If you could walk at a normal pace, this would be a fun little way to pass the time when you're waiting at the doctor's or something. (It's REALLY funny that there's a lore reason for the slow movement, though.)

"Oh but it's so easy to get lost!" ... It's a labyrinth bro

There's SOME neat ideas here and there (and by that, I mean the Sun Wukong Eggman boss was actually a cool robot design), but ultimately this is a blemish of a game. No redeeming qualities for a lot of it. Blue Marine Zone is the worst thing to ever come out of the Sonic series period. Master System port seems to run at a slower framerate too? No clue if that's quite literally just the game or if it was tweaked for 50hz displays or something.