Yeah this game is really too easy.
Building slows down time so I was able to build a power generator on each spot at the beginning of the game and then I had power to build as the enemy ships came in.
I built one blaster and one sentry on each spot and just continued to do so until I had enough energy coming in to build an extra power generator as I went on.
I then built a missile on each one.
And then removed the blaster and added a lazer on each one.
And then I removed the second power generator and built an extra missile launcher on each one.
I took no damage until a big blue ship was able to fire a -100 damage missile and then I built shields all over the planet.
As what others are saying. Yes a very easy game atm.