What a fantastic Pico8 game, honestly! So many different screens, very good pixelart, and a great sense of progression. Love the scrolling screen to transition between sections.
I found it strange that I couldn't backtrack, but it made sense on the end-screen where you get your final time and collected items. Maybe putting that in the description of the game would clarify it being part of the challenge and not let you wonder why?
I'd say the way you can grow and un-grown certain plants is not only satisfying, but counts for the limitation!
Awesome work, love it!