Just a quick update: I added a set of ladder tiles and some rudimentary (very) dark background tiles, to make the set more cohesive. Ever since this morning, I've had a lot of ideas that make more sense to put in their own separate sets. I'd like to keep the pricing similar or cheaper for the coming content. And I may revisit this one eventually to add some simple things like hazards, switches, pick ups, or other misc that might fit that "default grey" theme better than the other (more colorful) ones I started working on.
Thanks, again, for checking it out!