I decided to scrap the plans to make this an open-source project, since finding the right license was too hard.
That being said, this will from now on be a close-source game.
The GitHub page is now private and will stay that way until I find a new open-source license. After doing some thinking, I don't want to use MIT as the license.
I have decided to restart Cuberia's development in GDevelop, and have v0.3 and onward be open-source.