Overall good loop => do singles upgradeable runs to get long term upgrades. One of the worst UI I have ever seen. I had toruble finding out what to click to continue the game or leave upgrade screen. I don't understand what combined does. Does it upgrade my weapon from tiem to time? Should I be aiming to have 4 different weapons or optimize for single one ie. grenades. I don't find core gameplay that interesting. I am missing special rewards. Soemthing that would make me go wow! I really want to get this.