Terribly Executed
First of all, this game is nearly unplayable. I finished it purely for the satisfaction of of beating it, but uncovered countless game-breaking bugs along the way. Every time you kill a robot, it lags for a second or two. Controls are sometimes completely unresponsive. The keys are sticky. No, it's not my laptop, it's the game. Everybody else has found these same problems, and your game is the only game that lags for me. I even completely vanished from the screen once or twice. Aside from the bugs, the gameplay is simply repetative and not fun. It seems like you tried much to hard to add things to make it unique, and it came out frustrating. Also, if you're boosting and then die, you'll automatically go back to the beginning of the level 9 times out of 10, because the S key sticks and that chooses the "start from beginning" option, which really pissed me off to the point where I almost stopped playing.
If this is all you have to show for two years of work, then you've got a lot of things to improve on as a flash developer.
The only reason I even gave you four stars is because of my personal likeness for Rina-chan. She's wonderful. <3