I read in the game description that the red and blue berries have three growth stages, and that the second stage is the best time to harvest them. However, I couldn't seem to harvest any berries by pressing Enter, so I'm not sure if I was doing something wrong or if it's a bug.
I also felt that some sound effects would go a long way toward making the game feel more satisfying.
It has a lot of potential, but I think the core planting mechanic could use a bit more polish.