Great game for an original Gameboy game and a huge improvement from the first game. The controls are a lot better, the map is designed much better, and the enemy placement also isn't insane like the first game. There are still some problems, however. The boss fights are a little repetitive and annoying, there's not much variety in scenery due to the limitations of the Gameboy's color palette, and having no health/missile refills in the last area with the omega metroids is pretty stupid. But otherwise, I very much enjoyed it. The way you kill the final boss is pretty cool as well and I love the ending with the cute baby metroid.