The artwork is fantastic! I found myself trying to progress just to see what the next sprite would look like. Gameplay-wise I think it gets a little repetitive, it would be nice if each plant offered something new, like more/deeper roots, or easier sun collection. The failure states are a bit confusing as well - I get that running out of sunlight or water would kill me, but filling my water and sun meters to full feels like it shouldn't be a failure state considering it costs me time and effort to get that much of either thing. I like the root growing mechanics, and I think it would be really cool if you could expand that part of the game a bit more. It would be cool if your root from yesterday stayed in place, and a new one comes out each day, forcing you to search in new areas for water. The sun collection mechanic was fun too, although thematically I'm not sure why collecting sun would be a rhythm game.
Good game!