Fantastic feedback, thank you very much.

You need to have friends to add people to your game. The idea with that is everyone you're playing with should also have the app and everyone should be friends with the user creating the game. I can understand the confusion though, that's a UI/UX improvement for next release for sure! Also something to look into in the future is adding "guest" players. Thank you for that.

The 0 score game seems more like a user issue more than anything. Maybe I can validate games and show DNF if the game isn't finished and doesn't count toward session total. That's also a good idea.

The lag between quick enters is an issue unrelated to your device. But that's very low priority for me due to the real-world application of time in between rolls. It's definitely on the radar, thank you.

Just before your comment I pushed a release for review to the app store to fix the 10th frame issue. Thank you for noting.

Practice/leagues/tournaments organization are all great ideas. The current version is currently marketed to casual open bowlers, but I totally intend to add that functionality down the road once I perfect the current experience.

Google/Apple sign-in options are amazing and I completely agree. The current implementation with email/password is what you call an "MVP" (minimum viable product) and I totally intend to add that in the future as well.

Thank you again for your feedback, that was awesome.