Thank you so much for playing the game and leaving a comment, really appreciate it!
There is an ending (once all grass has been harvested), but don't worry if you didn't play that far. It takes quite some time to get there and all you get in return is an ending screen with some text, so nothing too special (yet, updates are planned...)
The one with the different symbol unlocked something else that you may have only noticed subconsciously, and that is "Auto Harvest". Once unlocked, the player will harvest without having to keep the interact button pressed.