I attended the LA jam and was in a team with Brendon Chung (of Blendo Games) and we made this goofy thing:
It's pretty fun to play with 2 players.
It was a fun experience. We fleshed out the idea of noise attracting one kind of monster and light attracting another. Pretty shortly after that, Wallace Huang just started building the game framework in Unity (like getting a thing to move when you hit the wasd keys).
James Liu wanted to learn Unity so he started making random things like clicking the mouse to spawn enemies as a "debug feature". James and Brendon were also excited to have a whole physics engine with particles to play with so they started making placeholder enemies out of rigid objects, and started figuring out how they would move to attack the player. By the end of Friday night, we had these balls and cylinders that would follow the player and they would pile up and collide and fly off and do all sorts of hilarious things depending on whether the baby was glowing or the parent was singing.
My favorite stage of the game was late Friday night. The "sound monsters" were rigid object cylinders that would chase the player. Their movement was based on physics and collisions and the "attack" was basically just a force toward the player. As the player sang the lullaby, the cylinders would move toward him and would almost immediately fall on the ground. After that, their only means of locomotion would be to roll. But if the player just stood to the side of them, they would pathetically roll back and forth, trying and failing to reach the player, like some rabid flipped-over beetle with no legs.
On Saturday, we decided we were having too much fun testing these things out and the "test bed" became the game itself. So it was just a matter of tweaking gameplay mechanics, setting up some goals, rules and obstacles, and getting art in.
Aside from chipping in with design and tweaking, I was mostly responsible for the art. I had a lot of issues getting things out of maya and into unity so the actual nuclear baby throwing a tantrum and crying nuclear tears at the end didn't make it in, even though the asset itself is sitting there in the project, mocking me. But that's also the charm of these jams, you can only do so much in 48 hours and you just have to let things go and focus on what's most important.
Suprisingly, a game called "Nuka Baby" doesn't even need to have a model of the baby to be fun.