Berzerker: Those are some heavy drums! The beat sets the mood for an industrial fate-defining track and several of the supporting instruments have a decaying feeling which makes me think we are on an alien ship or maybe a deserted space station. The reverb of the piano is so full that I get the sense that you are intentionally going for a distorted feeling which I think helps with the alien vibe.
Beyond Horizon: The electric guitar vamp puts us in a different mood from the first track and gives this one more of a contemplative tone.
Hidden Civilization: I like the inclusion of strings with the big industrial-sounding drums. I think one critique I might make from a mixing standpoint is that the kick drum is maybe a little too far forward in this track. I was wanting to hear the violin melody at the forefront and the kick was a little distracting. Otherwise I think this track has a lot of emotional momentum which makes it my favorite of the OST!
Pulsar: Nice beat! I can definitely imagine this playing in the background of an alien factory/space station level in a game!
Overall: The screenshots you included look like you created this OST on a phone. If so, that’s quite impressive! Did you do any of the recordings yourself? This was a fun group of songs to listen to and I think that they do a good job of conveying the otherworldly alien-ness you describe through a good selection of synths and “decaying” and overdriven/distorted sounds. Nice job and thank you for sharing!