First thing I tried is dropping a git repo folder to the window, didn't work. When I click the open button I can see the Javascript animation glitching on my 'Early 2015 i5 2.7 Ghz MacBook Pro'.
The commit list UI is kind of alright but it doesn't show you the diff anywhere. So that's not exactly a Git UI, buddy. And this is not open source either, that's a lot of strikes. No thanks.