✅ Press the "Start" button to get to the level selection. ✅ Select a level. Start with the tutorial by pressing on the light blue square. ✅ Hold [space] for a boost! (mouse and touch controls have boost automatically) ⚡ To make a custom level, click on "See inside", go to the sprite "CUSTOM LEVEL", scroll up and follow the instructions there. (if you have any suggestions, tell me in the comments!)
I merely edited the Razor Sharp level to be a bit more fair (you can actually see the rods that spawn on top of the big guy now) Everything else is by their respective creator.