I guess it would become a complete tool if you were to remove the functionality to play the levels inside the app. Probably export to stand-alone games or make another tool to play those games.
Both applications would be identifiable as a tool.
Just take them apart. It's that easy.
For examples, I think Pico-8 or fantasy consoles in general are great examples. Or probably make a rom file and then make an emulator to play it. Both the player and the maker would be tools.