Hell Gun

I’ve reached the max upgradable categories there’s two of them locked and a section with 3 stars is there an update on the way to unlock all this? Other than that I like it

This is a fun game with easy gameplay and nice variety of weapons, but I have done all the available upgrades but there are still two other upgrades to do but won’t let me chose them, and at the bottom of the screen there is a star with question marks beside it that I can’t choose either. How do I get these? Otherwise this a really fun game!