Never really could get into FTL, but this take on the concept has me hooked. One thing, though, is that it won't install via the Itch app. Perhaps setting the platform for the download might fix this issue?
You need to set the platform for the download, or the Itch launcher will just say "Game is Not Available".
It's easy, You just have to click the checkbox.
https://itch.io/docs/itch/integrating/troubleshooting-guide.html