I picked this for my SPY spot in the Retro Achievements Challenge. A fun and challenging run & gun game that punishes you for going too fast unless you've died a few times and you learn the patterns. But be forewarned, one shot kills on you. Unless its a grenade (Which you don't get i-frames and they will spam grenades) or they punch you. You can walk into the enemies to push them back and not lose health. But its very quirky.
The game starts mild mannered until round 8. Where there's a huge spike in difficulty because of the boss. Having to shoot in four corners whilst a crosshair is jumping around the screen can really take a toil on a person. The final stage of the game is the worse because in order to have enough bullets to even have a shot of the boss, you have to play the whole stage flawlessly. The only check point is at the final elevator where you have to use at least 10 of your 40 starting bullets and the first phase of the boss takes close to 40 shots. I'm glad I am done with this game.
At least the music is fantastic.

I was suggested to play this game and it didn't disappoint! You might only get one life in this game but it's very generous with items and a password with every area you complete. The music is fantastic! And it's just long enough that it doesn't over stay its welcome. It has some fun concepts with its water mechanics and cloud platforms that you can slowly fall through. I'm also very impressed with how many enemies can be on the screen and the Game Boy just plays it like a champ and doesn't even lag.

I played this for Retro Achievements Challenge. What a fun little 2d platformer with charm! The music is jazzy/big band and its fantastic! The game isn't that hard but it ramps up in the final two stages. Eight total stages with five boss fights. And one boss fight, you need to know how to pick up items to throw or you aren't finishing the boss. And with 6 buttons, the manual tells you that X,Y, and Z aren't needed. So they thought that holding down the attack button was the best bet for this action. Other then that, still a fun playthrough.