My first game jam too, although i already made several games and app using Unity. However, this is kinda my first time doing everything alone as I mainly programmer myself. Not everything made from scratch though as I already have library for several asset. Only have to learn a bit of Blender to do simple modeling and rigging (platforms and hand animation).
You can play game here : https://itch.io/jam/gmtk-2019/rate/462597