Meta Quest runs on a special version of Android. Traditional malware is basically unknown on that operating system. Something like an anti virus app is mostly a placebo on Android. For one, it would not even work, since you would have to install it with admin privileges, which you typically do not have.
The app you used seems to have done bad things. It could be a case of an amateur developer releasing something that just does not work properly. Or intentionally would mess with your device. Or, of course, some sort of attack. The internet tells me, that this is super rare on that device.
If you still have or can access the download file, you can try testing it on virustotal and see, how "scanners" would judge those files.
Btw, what happened to the project page? Does it still exist? Even if it is not malware, you should report it for not working properly. Itch does remove malware, but if no one tells them, that it is malware, how should they know? Scanners obviously did not catch it, or how else could you have downloaded it.