I'm disappointed that this isn't a stealth/survival horror game from the perspective of an alien monster trying to escape a spaceship and stalking the soldiers trying to capture him, that ends with the monster taking a smaller craft and landing in Hawaii.
You are trying to fill in sections of colors that are touching, either in a straight line or a grid of blocks. The numbers are how many blocks are filled by that line or grid for that color.
It ends up being a mostly mindless but relaxing game.