I love sci-fi games, especially sci-fi games where you get to fly spaceships and shoot stuff. So this is right up my street!
The controls are a bit daunting at first, but once you play the game for a while the muscle memory sets in and it gets easier for sure. It's a very old school methodology, which I love (Defender used to be one of my favourite games back when I had my Atari!), but it's been so long since I played a game with the whole "maneuver your ship and then move forward" mechanics that I found myself floundering a lot, much to my own amusement haha!
The level design is very nice, the maps on each level are very well put-together, the variety of enemies is spot on (and I'm sure we'll see a lot more variation as development continues), the side missions really add to the experience and the grading system is great! It really gave me something to aim for on each level... although admittedly I set my sights pretty low!
This is shaping up to be a pretty amazing game, so keep up the awesome work on it and I hope I get the chance to play more of it soon =)