Meh... too hard, but well thought out.
A lovely looking game, but on the easiest difficulty level it's still too hard.
I thought I was doing well, 6 power plants, 5 mines, slowly terraforming. Then I bought a research centre, what a waste. How are you meant to get the $5k (or $20k!) needed to buy those things, when you get so little income to start with. By wave 25 it's all over, a single ship hitting the city does over 1000 damage.
Sadly, a lovely looking game, funny alien, etc... but let down by the fact it's impossible.