I've never seen a side-scrolling farming game. That was an interesting idea. Loved the art. The sound design was really good too. I got all but the last upgrade.
While this was a novel game idea, I wouldn't have made it to the first upgrade if this wasn't a game jam. The robot moved so slowly and while it did give the feeling of an old ponderous mech, it made the gameplay loop very tedious. I also couldn't tell if watering really had any effect.
Overall, nice concept!