Lovely art, I love a plant-themed game. A few things I think will make the game feel more intuitive: letting players swap plants' positions without needing to move them to another position first. The detection of plant moving seems to rely on the mouse position, so sometimes, even though the plant sprite is in the placement area, it won't move because the mouse is outside of the area. I think it would feel better if the detection aligned with the plant sprite. Still, very good job!