The graphics are really good here! Like wow, you even got SHADOWS to move with the plants, so good job there!
Some sound effects would be nice.
The unicorn movement was very odd. It seems like the unicorn can only move by tacking left and right. I'm not sure why a more conventional up/down/left/right/diagonal control scheme wasn't used.
The game itself is very creative and had an "open-world" feel to it since it could scroll in different directions. While playing, I was pleasantly reminded of this funny toy called "The Avenging Narwhal".
Game tips were a nice touch!
The screen felt a little small. A larger default screen size or full-screen option would have helped.
Overall I'd give this 4/5.