Well game is nice, hovewer here are some things that could be better.
Your units are hard to control: you have only one type of command, 'go there and back to base and back to point, attacking all you meet'. So i cant leave them to patrol area, nor i cant order to not pursue specific enemy units (esperally when with bombers I want to attack enemy Rocket Cruiser ignoring random fighters, or when i want to destroy enemy heavy bombers with my weaker fighters and 'hit-from-behind-and-run' tactic)
Another thing are ships. Not sure if one have to even buy bombers, since they don't ignore fighters (and get destroyed) and if they reach enemy heavy ship, seems they dont deal much more damage than fighter group. May be you have to put some real stats in game so we can see truth.
Defenders are only bit better: while they are less fragile (nearly twice as), they are losing in numbers (almost twice as) and have less firepower and speed. Their omnitargeting is useless as enemy will dodge most of that shots and defenders themself will pursue enemy as if they were fighters. Nice idea, bad inplementation.
So really we have only fighters. Hull upgrade is mostly useless, best defence are defence and low respawn time (and Instant Respawn along with other Powers). Game have too little content.
Also, controls are not so good as they should be. Lazor Power (aka moon cannon) must be used once you clicked it and game dont shows you it. Easy to click one hangar instead of ordering to go to that place fleet of another hangar. And i described problems with ordering
So it's all. 3 of 5. I liked it, but it have problems. Sure this can be fixed soon.
P.S. Extra content suggestion: additional special hangar which produces automatical "Sputniks", special ships which can only move on Earth's orbite and cannot be controlled (auto move), sputniks have inproved range and omnidirected fire like defenders, and are used for defence in case main forces are far away.