Math is not correct, some gameplay bugs ( no fun intended) – Sentinel 4: Dark Star Review

I feel like i am overpaying for all upgrades. At radius 99, 5% upgrade makes it 101, next 5% upgrade makes it 102. Which makes no sense to me. Some levels can be zoomed to out, some (especially portrait orientations) are not. Some additional buttons overlay turets menus. I feel like in app purchases are almost a must to have any enjoyable gameplay.
Review by ipad-user2343 on Sentinel 4: Dark Star.