No tutorial hurts, I have no idea what I should be doing to prevent them from destroying the clouds. Placing angels on red markings seem to prevent the enemies from moving, but its still not that clear to me. I don't know why one of the angels have some directional square moves, seems to do nothing? Also as enemies increase in count, its impossible to tell which enemies will move where because the enemy moves are all the same red color.
On top of not knowing how enemies work, having a real time restriction on a strategy turn based game is also a bad idea. I'm more confused than feeling panic.
I think you should put a lengthy "How to Play" in your game description.