Delayed response times on controls, collision detection issues, ridiculous deaths, and other annoyances throughout the whole game. There's a bit of Contra, Metroid, Trojan, and I'm fairly certain that the last stage music is from Castlevania but maybe it's just very similar. Most of the enemies were highly questionable, not looking like foot clan ninjas or the other villains from the original show. Maze maps had dead-ends and areas had you repeat grind a few times.
Some of the cut-scenes were decent enough to keep us die-hard turtle fans interested, and we got to see the cast of the characters we know at the boss fights. I never had the game as a kid but wanted to play it whenever visiting friends. Friends always wanted to do something/anything else, now I know why.
Annoying game, glad I'm through it so I can stick it on a shelf with curiosity satisfied and not look at it again.