Everything is workable but...
It would be better as a pure RTS. Instead of giving us the combat and strategy modes, just give us the strategy mode, make General Dem a hero unit capable of casting abilities on the battlefield and dishing out and taking more punishment than his fellow soldiers, but don't force me to command him. This became glaringly obvious on the third mission where you must defend a new base. My right side was broken through and I had to make the choice of getting Dem over there to try and fight off the invaders, or to build some new units to shore up the defense. I should have just been able to order Dem over there and then multi-tasked to build more units. Add to this the fact that the combat mode controls are little more than garbage and you get a broken game that isn't fun or challenging, its just frustrating. And that's a shame because the strategy mode elements from commanding troops, to even really nice touches like defense turrets that a soldier can dismount from get buried under this intense need to get Dem into the fray so you don't lose, but end up losing anyway because he is so slow and unwieldy.
I obviously expect an "act 2" is in the works, and I would suggest just scrapping the mixed gameplay all together and only keep the strategy mode elements because you honestly have the foundations of the best Flash RTS ever on your hands.