Very fun game! The best strategy I found was to alternate between touching the left wall for odd rounds and then switching to the right wall for even rounds. I reached round 5 using this strategy, but then lost to some small flames.
I think that the game resolution/UI should be slightly altered to improve readability: on a minimised window, the health bar and current score weren't showing up for me. It's also worth considering adding a horizontal racing option for better presentation on landscape mode.