Hello,
Just managed to get into the EU beta and I'm happy to report that the game has been working with no major issues. One minor thing I found was that changing from fullscreen to windowed and changing the resolution may leave the window un-clickable. Just cycle to another workspace and back again. This should fix the issue without needing to restart the game.
No need for magic, just install the
Battle.net Desktop App (there is a crosstie for it) and when you get a key redeem it from your b.net account. The game should appear as installable once the key was redeemed. Click the install button, wait for the download to finish and click the big Play button.
For those that care about such things, yes, the game is made with Unity 3D.
The screenshots I've submitted have been approved and can be found in the relevant tab.