Do you plan to allow direct registration (without facebook) in the future?
Sure, phasing-out of a Facebook is already in a roadmap. Given the recent FB lengthy network interruptions, it is
necessary measure. This is also can be the subject of a censor in some countries btw.
I also don't like using Facebook to log in to any account I hope you can use user registration for faster account recovery in case you forgot your login details, you should edit how it works I tried playing as a guest, and hits are not working I cannot make a hit, hopefully, you can fix this issue.