Omg that looks so nice! Would you mind if I have the link of the spreadsheet listed in the description?
1) It does. It includes crit successes and normal successes as well. Also, if you get it twice you can stack it. But I didn't use a number list for the options with the intention of having people roll. So if you like, you can pick another option or reroll!
2) You can choose when to use both -3 and 15 Hearts reward whenever you want. You don't have to use it if you don't want to!
3) The game ends at the end of Day 30. Of course, you can end it early or later if you like. I'd personally have an extra half Day 31 if I manage to get a date just for fun.