For something that's more of a prepackaged build-your-own-Linux kit, there's also KISS Linux[0]. It's kind of a microdistro with minimal abstraction over the raw guts, and "packages" are just pre-downloaded source code repos that you compile yourself.
The "package manager" is just a shell script. The installation process[1] is entirely manual, so you control every step as you bootstrap up to building your own kernel and installing each subsystem, all the way up to compiling and running Firefox. It's pretty neat.
unfortunately its been maintained by only one dev which seems to have turned its back onto tech and has fanished from the web entirely[0]. I think its been forked since and maintained by a small community[1]. I liked the concept and used it for some tiny test machines.
The "package manager" is just a shell script. The installation process[1] is entirely manual, so you control every step as you bootstrap up to building your own kernel and installing each subsystem, all the way up to compiling and running Firefox. It's pretty neat.
[0] https://kisslinux.org/
[1] https://kisslinux.org/install