It is half-baked. I'm migrating the Android app to Compose Multiplatform to target Android + desktop, and eventually iOS. There is a mountain of work left to do!
If you used the installer from tasks.org/download you should find Tasks.org under 'Installed apps' in your system settings. Here you can click on ⋯ and select uninstall. If you have any more trouble with this please contact support@tasks.org to follow up with me!