I updated Windows 10 to version 2004, which is the Windows 10 release for the first half of 2020. Afterwards, I was not able to open up Stick Arena through Steam. It says that it is running, but never opens the window.
Try & press down alt-ctrl-delete same time then load up windows task manager & delete the running program & try to fire it up again.
& you could always re-install the previous version of windows you had through control panel or (CMD) or command prompt if you will.
Hope this helps cause I had similar run ins.