Use the WASD or arrow Keys to move. Use 0 to enter the level editor (press it again to change it back) Use 1 to cycle through wood blocks. Use 2 to cycle through Misc. blocks. Use 3 to cycle through blue blocks. Use 4 to change it to a coin. Use E to change to the block your mouse is over. Use L to move through different levels (If the level doesn't exist, it will make a copy or the current level). Use R to reset a level. Hit 0 twice to save the level.
Griffpatch's Tutorial for Tile Scrolling Games Will likely be used to Re-Coil and future projects (C-Raft, and Mario Sandbox)