No, there isn't a full-screen option yet. I have resisted offering different resolutions and full-screen as it adds testing overhead. I have a bug with full-screen where the Windows Game Bar doesn't record gameplay and I expect this would affect other recording systems. I'll take another look at full-screen and resolutions once the feature I'm working on is complete in two or three weeks. I'll update this topic when it's done.
The current feature is taking longer than expected and I need to do some contract work for a while. I expect to get round to full-screen and resolutions in about six months.
