This is a cool take on the infinite runner - almost like it's mixed with typing games (obviously not typing words, though). I enjoyed it quite a bit, but it's pretty difficult. The arrows get lost against behind the rocket particle effects, and could benefit from being spaced one pixel apart so they don't touch each other.
The highest score I was able to get was 175 or so (Somewhere in the 170's). If you keep going with this game, I think it has a lot of potential. Some more sound effects and a little refinement of the clarity of the visuals, and you'll have a really fun game on your hands. Great entry!