Thanks!
Yeah, for whatever reason, I didn't think of the "pick up everything" mindset.
I'd wanted to expand on the game, but I could never figure out where to take it from where it ends. I couldn't figure out what the next level would be, while keeping the same gameplay. I did some work on a 3D remake of it a while ago, but I had the same problem of not knowing like which way to expand the gameplay, or how there could be a second level. I think I could more easily do the pickup/drop, item information-related things with the 3D version. But yeah, if I did finish the 3D remake, I'd like it to either be longer or have more replayability.