It uses Clear's boot manager:
https://ancillary-proxy.atarimworker.io?url=https%3A%2F%2Fwww.phoronix.com%2Fnews%2F...
as well as aiming for (if not already having achieved) statelessness (this post is from 10 years ago, it may have done it by now):
https://ancillary-proxy.atarimworker.io?url=https%3A%2F%2Fgetsol.us%2F2015%2F07%2F27%2Fc...
Solus also applies toolchain level optimizations. In certain configurations/packages it enables more aggressive optimizations, directly inspired by Clear Linux. You can see this in the ypkg source:
https://ancillary-proxy.atarimworker.io?url=https%3A%2F%2Fgithub.com%2Fsolus-proje...
Yes, it looks like the only way to get (a kind of) DOOM to run unaided on Termux is to do it via EMACS: https://ancillary-proxy.atarimworker.io?url=https%3A%2F%2Fwww.emacswiki.org%2Femac...
I was hoping there might be a way to do it via something like ncurses or svgalib, the way the Arachne browser works under Linux for example, but I'm no expert in these matters: http://www.glennmcc.org/aralin...
One of the most overlooked advantages to computers is... If they do foul up, there's no law against whacking them around a little. -- Joe Martin