Space to jump, or click on Doge or the background! Once you get to 10 points, you go to level 2, but the obstacles get faster, same if you advance to 20 points (level 3). At level 3, the game is infinitely level 3.
Credit to @TNT134068 for suggesting an update V.1-I shared Doge Dasher V.2-I made the rockets slower and with steam V.3-I got level 3 up and running