Checked out Fix it Felix Jr. on youtube, not my type of game but it looks really well done.

Prices are real reasonable

What may be a good idea since it's a genesis game is have a cart with box version & a fancier CIB with extras version because although I'm not a CIB/complete type collector all my genesis games are boxed since they're not cardboard and pretty affordable. You could probably charge like $10 extra just for the box and it'd sell better than the cart only.