I have downloaded the game and when I start the first mission, I get stuck on the loading screen.
Sorry about this bug!
Can you paste your logfile here please so I can have a look at it? (pastebin.com works well for this)
Mac: ~/Library/Logs/Free Lives/Second Earth/Player.log Windows: C:\Users\username\AppData\LocalLow\Free Lives\Second Earth\Player.log Linux: ~/.config/unity3d/Free Lives/Second Earth/Player.log