My advice on game engine.... Advice I unfortunately don't hold to ... to keep scope manageable - a smaller game engine provides certain restraints that benefit a game jam. I'm finding once again that I've definitely approached this with too much 'power' and ambition to get there and what I'll end up with will only be a small fraction of what I want it to be! Good Luck! (but honestly I'm working in Unity and its a perfectly fine engine for this Jam... Its more my vision that needs a leash! lol)(