The full game of "Teenage Mutant Ninja Turtles: The Cowabunga Collection" will be discontinued in Japan on the following date Friday, March 29, 2024 at 0:00 (JST) Online play will remain available after the end of sales. Also, purchased copies of the full game will be available for re-download from the Steam Store.
It’s cheaper on other stores. I found it for around 15 bucks on indiegala.