Solomon's Key is one of the earlier NES games that I remember playing as a kid. A friend of mine had it and I have vivid memories of us playing Solomon's Key and Arkanoid, they're weirdly related in my mind. Whatever, I didn't pick up the game myself until I got it used in high school.
As for Zippang? I just bought a copy on ebay that'll supposedly be here in under 2 weeks. My only real experience with the game was when I was downloading ROMs forever ago and thought "Oh hey! It's like Solomon's Key! This is cool!" but I never delved far into it. I'll post a more thorough experience after I've spent some time with it!