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What program do you use to put the tiles together and build your level?

You could use it in Unity or UE4 but also tile mapping via Gimp, Photoshop, Inkscape or similar programs are totally fine. 

I think it depends on you, which way you prefer to set up your game. 

I see.  Sorry - I'm just trying to figure out how to actually make this a game.  Thank you!

You're welcome