So I tried. I really tried. Maybe I just suck, but I feel the game is overwhelmingly unfair even on easy mode. I only managed to beat one level (the easiest one) in easy mode. I think it would have been fairer if either you had more resources at the start or the enemy also had some resource limit. It feels like the computer never runs out and you can't defend yourself against its ever growing attacks because your resources even with the production thing increase way too slowly and before you can even afford anything to block any of its attacks, you don't have any hp left. And even if you manage to put it there, in one or two blasts you already don't have it anymore.
It's a shame because the idea is so interesting and cool !
Again, maybe I just suck. But I think the game would really develop its full potential if at the very least its first level was fairer. Still it's a great concept, go for it if you're brave !