Would be amazing to have auto-upgrading for blood and brains once you reach max capacity. Would make this actually an idle game instead of a semi-idle game. Auto-construct is great though!
Tricks for some of the more difficult levels include (1) be agressive, sit close by and attack a stronger partner as soon as he upgrades (2) build your first lab early and freeze the opponent's first lab as soon as they attempt to upgrade theirs and load a lot of troops on it (3) concentrate your force and attempt to catch your enemy off guard (4) get forts near a stronger enemy that will gradually wear down his forces.
btw, you can beat lvl 75 with the above strategy. grab labs early right after enemy upgrades them, capture the two forts closest to the big dude, and maybe the central one, hold onto all the other generators and upgrade them, then don't let him get control of the labs (freeze him or capture him if he dumps a lot on one lab).
Might be good with a "game over" indicator, as well as a timer so you can beat your own best score. As it stands right now, it is cool but no replay value.