Review of Death March to the Parallel World Rhapsody

Generic isekai high fantasy harem self-insert anime that gets a lot right and a fair bit wrong. A few things that I'll warn you about, and if you don't like the idea of them then just move on now: the sound is awful. From bland voice acting to a forgettable, almost satirically boring soundtrack, the sound here just sucks the excitement right out of you. Next, the animation is nothing special. Not offensive, just nothing special. A couple of nice backgrounds, with plenty of characters in cities, even in the background, can't save this from overusing rather obvious CGI and forgettable,babyfaced characters. A couple of exceptions exist but unfortunately the MC isn't one of them.
Finally, yes, the MC is completely and laughably overpowered. That's established in the first episode. There's no power creep in the season, thankfully.

On to the good. Pacing here is actually really good. The story moves along appropriately, the intra-episode pacing is nice, and you feel a sense of progression without a sense of being rushed. Nothing really changes beyond the first episode, which doesn't really matter that much because that's not the point of the show.
Eyes are done either totally inappropriately to the character or totally fittingly. One or the other, there's no in-between, but more often than not the eyes are expressive and pleasant to look at.

Overall, this is one of those series where if it does get a season 2, I can almost guarantee it'll ditch its good aspects (especially pacing), but these twelve episodes are a low-stakes, gentle way to unwind that I can recommend.