=Graphics and Design (4/5):
The game opens up with a nice, clean looking design and when entering the game it continues this fashion. The colors also contemplate each other extremely well. The only point of critique I have here is that the font in the menu could be more clean (Sans-serif) and that the font in-game is atrocious. The faint shade breaks the design, and the font frankly, is too complex.
=Sound and Music (2/5):
When I start the game, I'm presented with a screen without any music, which is kind of boring, but not a big deal to be honest. Entering the game, I'm met with a piece of dark, slow music that doesn't fit the clean, fast style of the game. Choose something with less reverb and more BPM next time. Also, the lack of sound effects makes it dull. A "collect"-sound effect would be nice, and a sound when you die too.
I haven't seen this idea before, to be honest, but then again, I'm far from the most abid flash-game player. The idea isn't very original still, due to the lack of "something new". The rising tempo and collection are both things encountered countless times.
Also, the game presents an obvious issue due to rising tempo. It is something possible to "fuck yourself over". See this image for an example:
The game is fun for about two minutes, but gets dull due to the lack of variation. Try adding a little "sazz" to jazz it up a bit (i.e: medals). Also, try adding a leaderboard somehow, it makes it more appealing to the competetive people.
Hope my review was of any help!