Hello! Sorry that I am late.
Engines that have drag and drop interface or doesn't require coding is allowed. If you have a game engine that has an extension that is drag and drop (such as Blueprints for Unreal Engine). Ren'py requires code so it doesn't count. However, I will think about if I should allow people that are beginners to try programming without drag and drop interface. In out future jams, you can use Ren'py :D
If you have any questions, please reach out to me. I am mostly active on Discord.