Thanks Chillera! I'm aware of #1 as the game's currently meant to be manually downloaded (I'm not sure why the itch app is pushing it when I haven't yet set up the app integration - I'd prefer it didn't until I was ready for it).
#2 is a bug that's been cropping up only in the Kickstarter build the past few days, and which I'm trying to resolve for the March 30th secret content update. Right now if you can open the settings, turn off fullscreen mode, and turn it back on, that should reset it to 'proper' full screen! Sorry for the inconvenience there :)