Lesser known, but I cannot recommend enough going back and exploring the worlds of ZZT (and by extension, MegaZeux) as an early, amateur game engine. The projects are raw but endearing and an absolutely wonderful time capsule that still has a niche but dedicated following.
Some day when I have the time, I'd like to make an extended engine similar to this. Something with a simple scripting language, extreme flexibility in character and color sets. Ability to run and host your own game worlds over SSH or something similar. Just like a real spit in the face for triple A and going the complete opposite direction of minimal but super accessible.