press 1 for solid, press 2 for lava, press 3 for win pad, press 4 to set spawn point, press 5 to erase blocks. Press space to begin after you have placed the spawn point. If you can't begin the game, try placing the spawn point again. Wasd space controls and arrow keys are supported. Touch screen is not supported. ceiling climbing is a bug that i decided to call a feature. just jump onto a ceiling and hold the jump button and you will stick.
Got inspiration from geometry dash's level editor. All code is mine.