I played this almost 30 years after it came out and I loved it. I came for the music (Some of the best on the NES, serious contender here) stayed for the stellar game. Game isn't super long. Only five or six stages IIRC. But each one is well thought out. It's hard but with just a little practice and planning you can make it through. It's a futuristic space game where you can collect different weapons and freely switch between them at any time. Light platforming and waves of robot enemies. It's a hard to sell kinda game on paper but it's awesome. Just play the stage 1/ title theme on loop forever and ever.