I liked this a lot! I hope you continue to develop this. I loved the opening and closing comic sequence.
I found that it was difficult to know where my seeds would be planted before I fully upgraded the planting, and it was hard to tell what I was watering and what I wasn't. I really liked the spin watering upgrade! I didn't know when my ability cool downs were reset, some kind of timer graphic on the hotbar might help. I forgot about the upgrade tree at first, maybe it could glow when you first collect enough material to buy an upgrade.
I think some enemy waves that try to destroy your crops would be fun too.