I don't know C/C++/Java (yet), so I don't make stuff on Unity3D, Unreal Engine, or Android Studio. (My old PC can't even run UE4, and Unity has weird glitches. :( )

I therefore make my apps/games in MIT App Inventor and its forks. Yeah, they are not game engines, so what I make is not a proper A grade game. But Ludum Dare is more a learning experience than a competition, so everyone, have fun!

P.S. Don't forget to try out whatever I end up with, if you have an Android device. ;)