Can I change the game language?

There are no additional languages in the game as of now, but if more will be added in the future, this can be changed from the settings menu...

How do I delete or reset my account?

There is no built-in reset function as of now. 

What can I customize in the Options Menu and where can I find it?

The Options Menu lets you adjust game settings for a better experience. It is typically found in the player profile menu. From the Opti...