If you still have the IPA file for it, you should look into seeing if it runs on touchHLE [1], an emulator for early versions of iOS. They also have an app archive [2] if you'd like to give permission for them to preserve the game.
Thanks for linking to this project. There are some old games on iOS that I was sad to see go so it's great to see a project like this bringing life back to them.
[1]: https://touchhle.org/
[2]: https://touchhle.org/app-archive/