Firstly, nice game, :) It's simple, endless, and slightly addictive.
but... you should be using a rigidbody2d for the player and not just directly changing the transform., if you are using a rigidbody, you should first, use GetAxis instead of GetAxisRaw which makes movement more smooth (by default) and use rb.velocity for jumping.
*gasssp*
BEATT MY SCOOOREE OOOFF SIIXX MIILLIO-
you know what, I've had it, I've had enough getting funny high scores in every game, if you play the web games, you'd see me in every comment. Half of which involves me bragging about my insane funny-number score. But I'm done, I will try no longer.