What's the license for this asset?
Viewing post in Dark Dungeon - Side-Scroller Tileset comments
Hi!
Once bought you can use it in as many projects as you want(both commercial and noncommercial), as long as the tileset itself isn't being redistributed in any way.
For example:
If your game has a map editor, you can use it as long as the created maps only works in your game. If the editor allows the user to "export" the map outside of your game, you can't use this.