FYI - the highest level is not the most efficient. I calculated the most efficient for me was having 3 sec/ship (all turrets at the entrance), when the ship dies halfway to the corner
I love anti-idle games! This one is pretty good, been playing it for a few days. Just one suggestion - change the way numbers are displayed, it is extrremely uncomfortable to read them this way. 1. Ether remove all digits after . or leave only one. 2. Use k, kk, kkk... scheme, its cool =)