Thank you very much for replying. That Maria is the strongest because she is very rare is reasonable. I just wanted to mention it because of future updates. I don't know if you plan to decrease the difficulty of what is in the current version as more content is added or want to keep it at this difficulty. It's that she is so strong that she solos everything right now.
I don't understand how saving works. If I understand correctly progress is being saved when closing the game. But when I reopen and then try to start the game I'm being asked to create a profile.
Note: I always exit from the title screen.