That game template is not mine, I don't know if it's good or bad. Also, be aware that it's for Construct 2, you may have difficulties importing it to C3 if it uses any third-party addons.
If you buy it, you will be able to modify it as you like, or use the code in your game.
Try searching for other similar game templates in Scirra store, on itch.io, also check the Tutorials section:
construct.net/en/tutorials