who Is the alien guy in the tutorial

some people call him “flowlio” some call him ET, but what game is he really from?

He’s a nameless character from a free tileset made by an artist named Kenney. He released a free 330 image set recently along with several other artists and musicians. You can download it all free here. http://open.commonly.cc/unlocked

Yep, like Mhx says: Kenney is a game developer who releases piles of free art - you can also get them directly from the source here: http://kenney.nl/assets