I do like this game. There are however a few flaws in my opinion.
Being able to select multiple planets to send from all at ones. This doesn't really count as a flaw but it could be a good improvement.
The game never actually explains that the percentage slider has to do with how many troops you send, It took me some time to figure this out and from a quick look in the reviews I noticed there are others who don't know this.
The other problem I have with this function is that having to go to the slider with your mouse to change the percentage while you're in a pinch can be fatal. setting it up so you could do this with your mouse wheel (or something similar) would be a great improvement.
Apart from this, I do really like this game.
I hope my spelling/grammar was readable.