An Elephants Roominations

The elephant is hungry! It must eat all the trees, and then return home to take a nap. But eating has its consequences... be careful! Made for the Thinky Puzzle Game Jam with my custom puzzle engine/language, PuzzLisp (to be published properly when it has more features). Windows only for now, but I tried it on Linux using Wine and it works fine. Controls Move the elephant with the arrow keys or WASD. Undo with Z, Restart with R. PageDown/PageUp to change levels. G to toggle the grid.