Yes you can use on commercial use, and thanks for credit me!
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!
I think you're overestimating me haha. Well I'm not a teacher but one thing that's help me, it's use custom brushes, and layers mask. You can found a lot of tutorials on youtube about this. :)
You can use any asset personally and commercially, you can edit this asset. You can NOT re-distribute the file, no matter how much you modify it you can use it but not share or re-sell it.