Hi! I'm glad you are enjoying the game! Thank you for pointing out the typo. I'll make a change now.
As for increasing attributes, you can choose to increase your lowest attribute by 1 when a Love Interest's Hearts reach 10 Hearts for the first time. However, to have the combined attributes become higher than 10, you will have to play with the new optional Time Travel rule, as you can retain your attributes even when you time travel back in time.
Please let me know if you have any questions! Or the rules are unclear!!