Cool video :)
1. This is a thing with the Game Maker Engine, in Unity I have to config the sprites to look pixelated, otherwise would look blurry, so maybe its the same thing with Game Maker.
2. Yes you can use free and commercial!
I don't have any "Zen" background, sorry :(
Hi, sorry I don't understand what did you mean, what demo? If you buy the asset you can use commercially or whatever you want, or you can download the free ones and you can also use commercially.
Hi, I'm so sorry for taking so long to reply, about that... I design this background for a infinite runner game, so I do not made a tile set. Right now I'm very busy, but maybe in the future I can made tilesets for this pack!