Bringing the facebook game model to Kongregate unchanged was a bad idea. Come up with an interesting twist and don't try to be a kred leech and you might be successful.
Decent game. Calling it "hardcore strategy" is a bit of an exaggeration, though. The strategy is basically to survive a few missions until the good units are available, then upgrade them. Moving units to different sides of a little square is not really strategy. It looks like you might have been going for combined arms, but the Sniper and Mortar are too superior. Also, the limited unit count and spaces limits the value of combined arms. Unit upgrades only proved improvement rather than specialization. Separate slots for fighters and support units in addition to specialization upgrade paths would help.
Allowing drops to be obscured by the lower-right buttons is sloppy.