it's a fun little game. Take it off newgrounds and make a ipod version or something and sell it. i'm fucking serious. i've seen crappy games on the apps but this one here i'm sure you'd make money and promote your skills.
Graphics are so-so. Pixel aren't really my cup of tea. This game doesn't make me rage about it tho. it's fluid, not too bright, not too dark. It's a good combination with the colors. (Maybe a shade darker for the bonuses icons? the green i mean)
Music is... You can find better music easily. However I must compliment your choice. it's not the best, but it's very good. it fits with the game and is not too agressive.
Sounds are great. I have been known for having issues with sounds in any games but not this time. They feel natural even though it's similar to an 8-bit or 2-bits kinda sound.
Controls are perfectly fine. by upgrading the ship's speed they become more fluid and the ship is easier to control.
Bugs : collecting bonuses after having bought a gun but no ammos is as useless as not buying gun at all. might not be a bug in itself, but it is annoying. especially for I, who buy the most expensive gun and dont have ammos. I managed in the end so it's fine. If i can, anyone can.
Some walls have a slightly bigger hitbox than what we can see. Talking pixel, 2 pixel around would be the answer. Once known it can be easily dealt with, but it's still annoying. especially with 2 ships coming after you.
Achievement "100,000 points from bonuses" does not work. why? because not only does bonuses not give any worthwhile point (except resplenishing health or ammos) the random nature of them is too unrealiable to get to 100k bonus. i've got every bonus i could find in 2 runs and i can tell you it's impossible. The "100k points in one run" is fine though.
Achievement "99 km without being hit" does not work either. As soon as you get the maxed out warp you should have the achievement but it doesn't give. after which i did fly over 200 km (strictly speaking: the rest of the run) without being hit once. yet i didn't get the achievement. maybe the "warp" override have something to do with this?
You should put a Quality button. the game is light and doesn't lag much but since you can right click to change the quality, maybe you should add the button? I dunno, it's just less trouble for people like me. Won't influence much.
While the game itself is considerably good, there are small issues which affect my gaming experience. I'm pricky, I know. However in this specific case, it's because I want you to be known and help you progress. I didn't think i'd love this game so much. It was a pleasant surprise!
I'll pass the word to my friend. they got to try this at least once.
Good luck!