Visuals are beautiful, tree rotation is somewhat satisfying, mechanics are simple and has a good progression. Variation of growth stage and sell amount during day night cycle is a good one. UI is clean, music is calm and soothing. Loved it. Was hooked at the game for a good 15 minutes. No bugs encountered.
You can add more things like, bugs attacking the fungus, diseases, bad fungus, more challenging and more rewarding. Ofcoures there is unlimited things to add :D