Decent game!
As has been mentioned a few, this game could really need some hot keys :-)
With hot keys i'd mark this game up as 'excellent' rather than just 'decent'.
I had no problem with just the two angels, but when I added a third and fourth unit, of which one was an old angel, I seemed to do worse than with just two units, quite simply cuz it's impossible to make your units do what you want them to do as fast as the enemy does. How that works out is, you'd have to replay the lower lvls many times over, before your units would be strong enough to face tougher opposition simply cuz they can dish out so much more pain faster than you can without hot keys.
Anyway, good graphics, I like heaven vs hell games and seems like a decent rts (but looks like a turn-based game - got me all confused in beginning when the opposition just unloads on you like mad)