Great game from what I've played so far. It's one of those games that doesn't just require you to be good at maneuvering your ship with the arrow keys (Or the AWSD keys, whichever is preferred), you can get better just by playing it long enough :) I haven't quite yet finished the game, but I plan on doing so in this sitting, shouldn't be too difficult, flash games tend not to be, but they are still fun of course :) The graphics of this game are very clean, and I especially like that some of the upgrades to your ship don't just enhance it in terms of performance, but the enhance it visually as well (I kinda like what you did with the starting ship though, it's kinda funny to be flying around in a giant log :P)
There is one minor (I emphasize minor) complaint I have about the game, I don't know if it is due to my incompetence, my lack of visual perspective, or just something wrong with my experience in general, but whenever I go to the instruction tab, there is no way for me to return to the main page to start/continue the game. I've tried clicking the menu button and also did some random furious clicking, but nothing came of it, so I've had to restart the game every time I've went there (Just if I needed to recheck something I forgot on the page). If you (The Author of course) read this, and can do anything to change it or enlighten me of any stupidity I might have, I'd greatly appreciate it :) Once again, great game, and I will stop by your account to check any other submissions you've made ;D