Check for "false positives" in the comments of the site you found it on.
If you are looking for a review of the game content corresponding to that version (which is an early-access build from 2021), here is the consensus: File: Dysmantle.v0.6.8.16.zip ...
: Relatively simple top-down combat with dodging and hitting. It’s not the main focus, but it provides a necessary challenge during exploration. The File: v0.6.8.16.zip Check for "false positives" in the comments of
: It satisfies a very specific "cleaning" or "completionist" itch. Unlike many survival games, there is no hunger or thirst meter, so you can explore at your own pace. The File: v0
If you want to experience the game, the modern version is vastly superior in terms of performance and content. The early v0.6 builds were essentially a "proof of concept" compared to the full release.