This is a good game... Never in my life has my heart pounded so much when trying to finish. It really makes you think about how to spend your ether. When the enemy upgrades, then it gets even worse when you die and have to wait for ten seconds for the ship to rebuild. There were a lot of clutch moments in the game where I thought I was finished. It is really helpful to upgrade the allied units first, and then you can go on the offensive once you get all of the other upgrades. Over all, this game is hard, but enjoyable if you play it right.
Thank you so much, that means a lot (: I'll do my best to always provide the best content for you!