The following keyboard shortcuts work in the Crater Editor:

Delete - Delete the selected element

Shift - Hold down the shift key to select multiple elements

Space - Activates the Hand tool

←, ↑, →, ↓ - Move the selected element

Cmd + A, Cmd + 1 (Numpad) - Selects all the elements

Cmd + X - Cut

Cmd + C - Copy

Cmd + V - Paste

Cmd + Z - Undo

Cmd + Y - Redo

Cmd + = Zoom in

Cmd - = Zoom out

Cmd + 0 - Zooms out to the smallest zoom value

Cmd + 1 - Moves the Editor Workspace to the original coordinate

Cmd + S - Save changes

Cmd + Q - Discard changes

Tools:

Alt-shift-7 - Activates the Line tool

M - Activates the Rectangle tool

L - Activates the Oval tool

N - Activates the Shape tool

R - Activates the Rotation tool

E - Activates the Free Transform tool

Z - Activates the Zoom tool

H - Activates the Hand tool

P - Activates the Photo tool

I - Activates the Eyedropper tool

Y - Activates the YouTube tool

Cmd + Space - Activates the Text tool

Esc - Unselects element from the library when placing it

Learn more about the keyboard shortcuts for the Crater Editor (for Windows).