I think converting your models for game usage could be a lot of fun, although it's a big step from just using models to actually make a game fun to play.
For what you're trying to do, I recommend contacting this guy (Oscar Torres, I think is the name), and seeing if you can pick up any tips:
https://www.instagram.com/creaturefactory54/?hl=en
https://www.instagram.com/_retrostation/?hl=en
http://oscartorres9.wixsite.com/oscartorres-3d
As you can see, he's trying to redo the original TMNT arcade game using models heavily inspired by the 1990 film.