The American NES/SNES libraries combined are large, but not impossibly large to collect. It's a bit pricey to do, but you can track down the majority of the games fairly easily. However when you're striving to collect the entire catalog of games, including Famicom and Super Famicom, that is when you run into some really obscure titles.
For me, I've never heard of Panic Restaurant and I giggle at the name Bump n' Jump. Have you played any of these?