The game and graphics are pretty cool, and the story is nice (though I think it could be deeper, but it's good the way it is)
but the game can get kinda boring later on. It gets easier as you get upgrades. From the fourth mission, there are a few new things such as "scan" and "mining", so I think there should be more new missions from a certain point, where you begin gathering strengh
And new kinds of upgrades would be cool too, like some radar that warned you from where the next enemy would come (left, right, center..), or some thing to desaccelerate the ship so it could fit between 2 bullets easier, like in those bullet hell games
I think adding these would be cool because on most of the missions it's just evading bullets while holding X and that's it, destroying everything in your way.