Very nice. Great art, the starting ship feels great, and so far controls, etc. seem intuitive. I'll definitely be buying, but I hope you have a lot of content that wasn't shown in the demo (because I feel like you have the base of a potentially great game here).
Some feedback, FWIW:
The font is readable and the style is good, but I felt like I had to work a little more than I like to read it. A smoother or more "clear" font would be easier for quick reading. Not a must have, just something to think about.
The shaky camera effect when moving was disorienting and it might limit my time during game sessions. I'd either turn it off or provide an off button in the settings - or a 'shake strength' slider, but I think 'off' would be better.
I'm also hoping that different ships move and handle differently. Not a requirement, but really nice for this type of game.
Thanks!