Do we get any special badge or cosmetic in the final game for participating in the Open Alpha? Do we get anything for maxing out a character's level in the Open Alpha?
Yes! We have a skin for everyone who participated in the alpha (but not for maxing out, given that the alpha is a short window). We also are doing twitch drops right now where you can get an Aeros Carbine skin, and of course we have the Hunt the Devs skins that you get for killing devs (if you don't get it this time though, we plan to bring back this event in the future so don't worry). All skins you get in Alpha, will carry over to the final game.