It's true that Hytale has been marketed as a game that is easier to mod. Yet, it is still important to obtain permission from the appropriate parties, such as the game developers. In addition, it is important to note that creating movies or other content using game assets can be considered a derivative work. It may require a license or permission from the game's copyright owner. At least, this is how the teachers from praguefilminstitute.cz taught me. Therefore, I recommend you to review the terms of use and any relevant copyright laws before creating and distributing any content. This will help you avoid problems.