b paint   v select
space play   [ ] frame
n new   d dup   ⌫ del frame
o onion   s symmetry
⌘z undo   ⇧⌘z redo
⌘a/c/x/v select/copy/cut/paste
→↓←↑ cursor / nudge selection
esc clear selection
shift+drag = erase (paint)
alt+drag = duplicate (select)