Interesting little game, I thought it was pretty funny and a unique idea. I can picture a crazed botanist, sleep deprived and cold trying to protect a flower by all means necessary and unnecessary.
If you wanted to improve, I suggest adding some form of wind mechanic or some way to force the player to move around. I ended up being able to stand still and beat all three levels due to lucky RNG. You could also add in other threats like people trying to walk on the flower or animals trying to eat it.
It's a short game but entertaining for what it is!