I own JP2 and have played TMNT several times. I think you should buy JP2 and see what happens with TMNT, there seems to be some mechanical issues that may get fixed in future builds. You know JP2 is polished and is challenging enough not to get boring in a home collection. FYI I plan to buy TMNT so nothing wrong with that game but it seems way easier to shoot and the modes currently don’t feel nearly as satisfying as collecting a fossil or catching a tough Dino.