Made it to level 10 :)
It would be awesome if there was a tutorial at the beginning to explain what all of the different upgrades and people do instead of giving it to the player all at once. Adding in some visuals to the plant to show off its growth would also be a nice touch (maybe the plant starts small and then grows bigger.). The artwork is great so would love to see more of it.
Overall I thoroughly enjoyed it! Fun experience and I could see it being easily expanded upon. Great work