Not really “Games” related, but besides well established Marxist channels like Hakim, Lady Izdhihar, and Yugopnik, as well as news outlets like Breakthrough news, Mintpress, Grayzone, Mondoweiss, etc… Some of mine but far from all:

Indie Nile is pretty good. A Palestinian drag artist who makes videos talking about Palestine, the Zionist entity and Western double-standards.

This guy is very informative when it comes to the perspective of the former eastern Ukraine which were liberated, particularly Mariupol and countering Western propaganda regarding the proxy war. Not explicitly a leftist but still enjoyable to watch.

DPRK Explained for learning about the DPRK.

Another DPRK channel

A channel uploading old radio broadcasts mostly from West Asia and North Africa, but also others including Cuba The Libyan Jamahiriya uploads are of particular interest, and there are also ones from various SSRs.

Channel archiving and preserving Jamahiriya-era Libyan revolutionary media, very important.

Mostly shorts-content based news channel focusing on the AES Sahel states recommended for those wanting to keep up with the news there. Not perfect but provides a good overview for further reading.

Channel about Mahmoud Darwish poetry

Ambient videos based on historical scenes and atmospheres