Hey I played the game, I was also confused where to place the plants and animals, I think maybe the highlight wasn't bright enough so i thought it was just part of the grass. After I worked that out it was fun though.

At a certain stage, after being bombarded by pigs, sheep and geese left, right and center, the humans stopped coming but there was no clear ending or "You Won screen" was there meant to be?

Overall I enjoyed this game :)

If you haven't checked out mine yet please do! It also has sheep haha.