Could Be 5 Stars ~ 2 Huge Bugs

This app is my favourite Space Shooter genre game ever.
Unfortunately, the bugs are absolutely peeving over time;
1) Every time I upgrade a piece of equipment using Gems, then attempt to select another piece of equipment, the buttons on screen fail. This forces me to manually close the app and reopen it every time I go to upgrade equipment.
2) The ships in the shop that cost 3 Cores are unpurchasable. I have obtained the 3 cores requisite to unlock the AKAMA ship, but, unfortunately, the game does not accept Core transactions, instead saying "You do not have enough CREDITS". Credits are not the currency listed for purchase.
After running 12 bosses for those 3 cores, I am severely unimpressed.

Fixing the core issue alone will get 4-5 stars from me.

Personwhojustplayedthisgame about Gemini Strike: Space Shooter, v1.1.0