So far I got:
- Solaris
- Ikari XB-1
- Come & See
Also:
- Viy
- The Sacrifice
- Satana (1991)
Plus a bunch of the ones mentioned in the comments now.
I think Soy Cuba still holds up. Gotta approach it with a bit more attention span than common, contemporaneous cinema tho.
It has dialectics with film language, an increasingly radical set of characters, high-tech (for the time) IR film shots and some incredible long shots that still baffle the mind.
Kalatosov’s Letter Never Sent has a few of those badass tracking shots, too, and turns them to 11 during a Siberian forest fire. Stunning stuff.