[pibefision]

It seems like GEOS from C64. I like it!

[scarygliders]

My immediate thought was "This looks like GEM" [https://en.wikipedia.org/wiki/GEM_(desktop_environment)]

But your example works too - loved GEOS back in the day ;)

[cout]

I have more than once pondered what the world would look like if GEOS had become the dominant GUI in the 90s instead of Windows.