I will not lie, I actually like the game. I think I found it helpful that my plant died the first time in order to start playing well.
The things that I see that would heavily improve the game (not that I am a seasoned game dev or someone better just what I feel like suggesting) is that you increase the font size, maybe make the game fit into a smaller box with all controls laid out through the left side of the screen instead of buttons for navigation, the plant in the middle as the center of attention with some light or something, and all indicators as you have them.
I feel like that would make it easy to see, compact thus easy to navigate, and a spotlight on the plant we want to keep alive. Overall, I enjoyed the idea and I am sure adjustments would make it more fun.