Godeater, of no relation to the psp game/anime/soulslike spinoff, is a mildly crunchy osr dungeon crawler with a lot of cool mechanical innovations. It's 14 pages, and feels a bit like Into The Odd in that it pares the genre down to the bone and then starts fresh from there.
The mechanics are 2d10 against target number, with your attributes being pools that you can spend to boost your chances of success. For the most part, nothing rolls against you, so an enemy attack is simply a defensive roll on your part. This mix of limited resources and streamlined rolling keeps the game tight and tense.
There are also a few neat little mechanical flourishes. The Retirement mechanic from Dread (not the Jenga one) is here, as are Tags from PbtA, as are Arcana from Into The Odd, and HP is simplified down to four wounds per character.
There's also a fairly standout system for magic. Anything you aren't doing via artifact comes from a direct negotiation with a god or powerful terrestrial spirit. Essentially, you in-character offer stat points or services, and depending on your offer and the god's nature, it might accept.
Character advancement is largely feat-based, although the feats can fundamentally alter just about any part of the character. Even so, they're interesting and flavorful and feel like they allow characters to grow in noticeably different directions.
The rules being the absolute first thing in the book, with no context or setting flavor, does create an extremely blunt first impression, but it's worth getting past that. Setting-wise, Godeater is a mix of Into The Odd and The Nightmares Beneath. Gods are broken, corrupted things, and their bodies are intruding on the world as planes and dungeons.
There's an elegaic, gothic Dark Souls vibe, but the overall direction is more energetic, direct, and I think I'd call it godpunk or dungeonpunk instead.
For only 14 pages, there's a lot packed in here too. In addition to the full rules, there's several optional player races, crunchy character advancement, a bestiary, item and arcana lists, and a really excellent GM's guide. It's very full.
Overall, despite some roughness to its first impression, this is an extraordinarily solid game. If you like osr, atmospheric settings, light but crunchy rules, and a best-of-all-worlds approach to design that grabs the best elements from a dozen different sources, I would highly recommend grabbing a copy of Godeater.