We have an updated and harder version of the game! (BUT don't use that to rate us! only play it if you liked this game and want some more challenge).
Here is the change log for the harder version:
You can no longer jump while looking to the left.
Above 2,000 score points, the enemy increases speed.
Above 2,000 score points, the enemy needs 2 shots to be stunned.
Every 2,000 score points, your stunned time (after bumping with objects) and the enemy speed increase a little (there's a limit! Can you guess it?).