I recently read through the Dungeon Crawler Carl series, new book in the series just came out so I plan on reading that one next. It's a comedy/adventure sci-fi and fantasy. It has elements of class oppression and intergalactic revolution. It's not strictly Marxist, but it's not horribly lib either. It's a fun story and it's not just a power fantasy as most stories in the "Dungeon" genre tend to be (e.g. solo leveling).

I also read through the Convergence series, which is a fantasy story about the only wizard in modern society who is trying to stop a fantasy world from colliding with the modern world. It's pretty good, the comedy is quite good, and has hilarious references to marxism throughout. However, there is one section where they completely misrepresent communism which was unfortunate, but it is not really relevant to the overall story, so if you ignore that section it is an overall fun story.

next on my list is probably left hand of darkness or something from the discworld series.