I have never heard of this game before, and have just checked out the link you provided. It's quite interesting.
Steam is your anathema; GTK3 is mine! Valve's accountants wouldn't coincide that it's at all a blunder, but I agree -- it's a good idea poorly implemented, and its exclusivity is really baleful. Much of this is imputable to the incipient obsolescence and sequent productive decrement of optical discs in all media, which is a horrid trend to be blamed primarily on our respective generations.
Moreover, Steam's failings and abuses are microcosmically symptomatic of so many godawful trends: corporate overreach, exclusively non-physical distribution, and the commercial redefinition of ownership. You can blame Jobs, Gates, Ballmer, et al. for that latter. Crapple and Microsoft pioneered the corporate subversion of proprietorship, which is sick and unnatural.
Maybe this will help: https://appuals.com/how-to-play-steam-games-without-steam/
Maybe "blunder" wasn't the perfect word, because in the business world it can imply something which caused heavy financial losses, but I was of course viewing Steam from the perspective of the consumer. I agree that online distribution is not inherently bad; it can be done well, and it can be done poorly. It is a shame that Steam and many of the other platforms ended up being done poorly and restrictively.
I wrote this to try to turn other PC gamers away from Steam, as I believed that the arguments for doing so, when weighed against the reasons to stay, are very compelling. They have been for me, at least, as I have largely been able to avoid Steam. Also, don't say bad things about Gates and Microsoft! >:(
MS Paint's as reliable and serviceable as most of the many paint programs designed in the enduring mold of PCPaint and PC Paintbrush. I've occasionally used it in a professional capacity to tidy errant pixels in large images of photos or pages, and never suffered a glitch. Its limited functions are as flexibly and intuitively implemented as one could expect.
When I edit graphics and don't need or care to launch GIMP, I use XPaint or mtPaint, or their respectively forked variants, GPaint and rgbPaint. http://sf-xpaint.sourceforge.net/ https://www.gnu.org/software/gpaint/ http://mtpaint.sourceforge.net/ http://mtpaint.sourceforge.net/rgbpaint.html
I have to say, those are some genuinely well-designed Web sites you linked to. Unfortunately for me, it seems that XPaint and Gpaint don't work on Windows. (XPaint is even listed as compatible with Solaris, but not Windows?!)
No, those were programmed exclusively for POSIX OSes. If you're searching for an open-source paint program intermediate in its complexity, try Pinta: https://pinta-project.com/pintaproject/pinta/