Krita. It’s quite resource intensive and the UI has been ported directly from the desktop rather than being optimised for mobile, but it works, and it’s free and open source

If you dislike sci fi then yeah, sci fi games are not gonna do it for you!

Doom 2016 is certainly not the same, but it does keep the same feeling of fast and frenetic hyperviolence that you need to be right in the middle of, with minimal reliance on plot

Halflife was revolutionary when it was released. I’ve recently been playing through Black Mesa, which is a remake in the Source engine, with some parts changed or extended, and it;s absolutely excellent

Before that, Doom and Doom][ were the best FPSs. The 2016 remake does somehow manage to recapture some of the magic but the originals will always hold a special place in my heard