DIM is my entry for LudumDare 40.

I have just several resources that speeds up my development:

Sound Generation

https://www.bfxr.net/ 

Music Generation (!!!)

http://tones.wolfram.com/

Tween Lib

http://dotween.demigiant.com/

Open-sourced plugin for 2D light and shadow

https://github.com/SSS135/Light2D