Simple but pretty good endless runner game. As mentioned in Iggy's comment, the difficulty increase needs some tweaking: I didn't even realize there was another level until checking the comment because it was going on for so long. You could try a gradual increase in difficulty as well, instead of having it level-based. Last thing is that the failure sound effect needs to be MUCH quieter, it's at least 4x as loud as the rest of the game which is very jarring.