Had the same problem as OP. The game worked fine until a few days ago. When I tried to start it yesterday it suddenly disappeared. Not sure if after updating the windows store or applying any updates. Anyhow trying to redownload the game just gave me the spinning circle icon and nothing happened.
After playing detective for a few hours, I deleted the installation folder of the game which is located under C:/Program Files/WindowsApps/microsoft.GanderBaseGame_1.0.99.0_x64__8wekyb3d8bbwe.
Restarting the computer gave me some error messages saying that the game files were missing, but after applying the following commands on elevated power shell and restarting once more the game is downloading again. The error messages did not show up again either.
Try reinstalling gaming services. To do this:
Launch powershell as an administrator and enter “get-appxpackage Microsoft.GamingServices | remove-AppxPackage -allusers”
In the same powershell window, enter “start ms-windows-store://pdp/?productid=9MWPM2CQNLHN”
Install the app on that page, including accepting the UAC prompt when shown.
Try installing the game again.
Source: https://support.xbox.com/help/games-apps/troubleshooting/troubleshoot-games-windows-10
I hope it helps.