As usual, I am gonna be straightforward from the beginning - Grayland is a side-scroller, puzzle and adventure game, and I love it.
(Play in airplane mode so you don't have to see ugly ad blocks like this.)
The rule is simple: collect blue dots for energy, and avoid black spiky objects or cats or humans. The puzzles are not that complicated, but for someone who is not good at controls like me, they can be quite challenging (but not frustrating).
(One of many, many fails)
The first thing I love is the graphics. It's a noir world and the only bright colour is blue - the colour that can be related to technology or space. The slightly blurred background is a little unsettling, making you feel small and alone in the world. The silhouettes are also a brilliant touch.
(I assume this is some mecha like Gundam?)
And then it's the story: the non-human protagonist. You are a little bird and there's not much you can do. When you are flying past by battles or machines, you realise you are a bystander of a bigger story. I like the gap between what you can do as a bird in the game and what you can comprehend as a human.
So in conclusion, you should definitely try this. Hope you enjoy the game as much as I do.