I would greatly suggest letting the user try the app without making an account. I'm not sure if the app is something I like, so when the first screen I get is a

I would greatly suggest letting the user try the app without making an account. I'm not sure if the app is something I like, so when the first screen I get is a login screen the odds are high that you'll lose me. Other games often have a guest account for this with some random name, which they can then upgrade to a real profile by signing up.