edit: oh, it does. I never knew macOS native Calendar can sync to GCal. The more you know!
OK this is quite useless then. Especially as it is an Electron app.
That said, Itsycal doesn't seem to play well with meeting links - for example, I've never been able to click a Webex link from the Itsycal UI and have the meeting actually open; I think it's not passing the URL exactly, or something, but I always have to visit the Calendar app and click the link from there. Not sure if Zoom has the same trouble in Itsycal, but I can definitely see a potential win in something that does better with meeting integrations.
I'm still sticking with Itsycal at least for now; meeting link issues aside, it works really well for me and I'd rather wait for a real killer feature to switch. That aside, congrats and best of luck to the Superpowered team!
...which is not an issue on M1 macs, so far, but that's for now.