This is the free version. It is a much older version of the game with some limited features.
This version is released about once a month and is generally more stable than the experimental release.
In the experimental version, I try to release as often as I can. It could be a couple of times a day or a few times a week. However, it is generally more buggy and unstable. If you want to download this build, be sure to follow the updates on Patreon because I usually post something when I make a patch for the experimental release.
Note about patches: For the most part, anytime I make a release, the game will automatically update itself. If for some reason, it doesn't update, please re-download the latest builds from above.