You may:
• Study the code and learn off it.
• Use small snippets off it for your own projects (With credit).
• Make addons for it (EG: Resource packs, additional content) as long as they require the original mod to function.
You may not:
• Use this as a base for other projects (Exeptions with permission).
• Reupload to other websites.
• "Reskinning"/rebranding the project (superficial changes and renaming things)
Other notes
Using the mods assests gives me full permission to copyright you.
The sounds files are the only assets that are not copyrighted.
Anywhere the mod is put and doesn`t have me credited it most likly not mine.