Blaky! This is great. You have single-handedly solved the problem of how the Flood could be constricted into a firebase format. The one thing I would like to see in addition to what you wrote would be "Flood growths" growing out from Flood firebases, where the ground essentially becomes like the flood biomass in High Charity. You could possibly upgrade it to grow faster, and then mabye to grow Flood Infection Form pods. These pods could act soemthing like a immobile carrier form, and explode when enemies are close.
And also, something that could be added for the infection forms is to also infect any vehicle that is manned by organic units. It would take however many infection forms reaching and successfully infecting the vehicle as there are organic units in the vehicle. Of course, they couldn't infect scarabs.
Another possible addition, that is nescessary, is an anti-air unit. Otherwise, the enemy just has to spam banshees and vampires, or hornets and vultures.
Felix, 당신은 이 게임을 이미 했는가 또는 당신은 바나나인가?
Felix, do you already do this game and or are you the banana?