Interface seems gratuitously large except the status bar and clock and whatnot. In all the shots of the home screen (?) the on-screen navigation buttons seem to cover the labels of the app icons... sometimes. The "Muon" app has a smaller icon so the label sits higher... looks not so great.

However, it seems they're trying to appeal to the more Libre folks - anti-all-current-smartphone-OS-vendors and their watchful eyes - who are generally developer types -- at least as far as I know. And those types of people are usually willing to give in the UX department.

I'd love to see this (and any alternative smartphone OS) project succeed, but it's got a fair amount of growing to do before that happens in my opinion.

I would love to someday have Linux running on my phone and just be able to do whatever the heck I want with it with simple APIs for interacting with sensors and cellular voice/sms/data just working. Like Arch Linux for your smartphone. That would be so fun to hack on I think.