Re: Where to get more character upgrades

Once your character is level 10 you can 'promote' them. Go into your treehouse, go to your sunflower bobbleheads, you'll see a little up pointing arrow telling you that you can promote your sunflower. Promote it, and then the process of upgrading, getting to level 10 begins again. You will then receive another 2 upgrades. Repeat the process until you've reached 'Master'