Ikarie XB-1 is certainly not forgotten, I watch more often over time than 2001. All those classic czech, and also polish and east-german crazy science fiction films are still worth watching. Ikarie is a bit dry, but the others are mostly hilarious and very critical.

Indeed; I saw it (in London) soon after I moved to Brno.

It is, as you say, a bit dry, though...

Of west Slavic SF, my favourite is definitely "Sexmisja". :-D

My fav is Who Wants to Kill Jessie? Not much sci-fi, more comics.

In fact all Lipský and Vorlíček films. https://en.wikipedia.org/wiki/Category:Czech_science_fiction... and https://en.wikipedia.org/wiki/Category:Polish_science_fictio...