Hi Daoloth, that's sad, thanks for reporting this! Could you please upload your Log.txt file on some site like gist.github.com and post here link to it? Your Log.txt must be in the folder Contents/MacOS inside the Insatia package. If you're running Insatia via itch app, you can use 'Show local files' button to get to the package. (Just in case, you can use 'Show Package Contents' command in the package's context menu in Finder to open the package rather than launch it).
Also, do you happen to have multiple sound outputs? Like additional sound card, or speakers + headphones attached at the same time? It's possible we don't handle that correctly at the moment, you can try to disable or unplug additional devices and see if you can get sounds on other device. If it's the case, we'll fix it! Sorry for the trouble, we have very few Mac testers unfortunately, so some Mac-specific problems are hard to catch.