Fun game, but lacks sound. The gameplay is quite relaxing and I can imagine myself playing this on my phone while waiting for the bus. I liked the way you showed what a ripe vegetable looks like. It does have a pretty glaring difficulty spike right around the point when your score is about midway. A lot of vegetables grow at the same time and there is no way to harvest all of them before they go bad. This is the furthest I've gotten.
Some improvement you could make to the game: Add sound, change the colour of the "health" (At first I thought I was somehow supposed to fill them up since they look like silhouettes), show the score meter during play so you can track your progress as you go, and finally make the difficulty increase more slowly.
The text in the description is against the limitation, especially this bit: "Casual game where you should harvest the most height of vegetables that you can," since it outright tells you what the goal is. Removing wouldn't hurt that much, since the goal is pretty obvious from the game itself.
I'll come check out your game again once the rating officially begins. Good luck until then! :D