Wow, you did so well with that unity tile system! You got a really nice vibe going on here :)
I played on easy, and at first I was unsure it asked me for plants, and I planted flowers, thinking those were plants, too ^^
I would have wished for a world counter, where it shows me how many tiles of what I've already got or planted that day, depending if your goal was overall tiles or tiles done that day (cause its currently only counting overall tiles).
I could have done without the timer, rather automatically go to the next day, when I finished the task or give me an option to finish the day. Either way, please display a the task for the day somewhere (cause I'm forgettable like that) and a checkmark for if I already completed it :)
if you want to revisit the game, I would focus more on building your own world, maybe add some cute AI creatures that live in your world and interact with what you planted. Make new terrains and decoration unlockable :)