Glitchy. Just freezes with a lot of interface elements on screen after a wave. At first menu - quit-continue helped, after a second freeze it just stopped working. Also unbalanced - u buy MG, it just stands doing nothing cuz there are no flying enemies, then 10 big flyers come and kill some of your veterans because MG is not experienced enough to deal with them fast.
1 wave: cruiser
2nd wave: repair
after that: damage+2, control drone, second cruiser
3rd cruiser comes after thrustx1 plate x3 damagex2
add control and repair droids as needed
make cruiser #4 and more after you have all upgrades
and huh, forget bout silo drones and kill rockets first ;)