Great game. Takes a while to notice how the controls work, I would recommend the fast/slow motion to be controlled by just 2 buttons (faster or slower) or at least make it so you can change the speed without having to revert back to normal. Also the time scale should start on, you can toggle it off. Finally the game could have some competitiveness if you added a real-time time score- would make fast motion be useful. 4/5 anyways.
When it's spinning and turning, the game can become LITERALLY impossible. I'm positive because they stopped turning once and there was no gap to get through. I got hit, of course. You might want to fix that.
I might just not have gotten the upgrade yet, but if it isn't there, add splash damage, otherwise extra rows are useless other than giving more enemies, which so far is a LOT easier than shooting them down.
What if there is a F13 key, but when you press it the game begins and overflows your mind with so much awesomeness that your brain shuts down, causing you to forget about it and create a sudden lack of ability to notice the F13 key, forever locking the memories of this game. Whoa.
This game needs badges in the same way that games with achievements have achievements for getting a certain amount of achievements. Yay for extra points! It's not like they're used for anything anyways...
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look again