I'm the main programmer of Literal Games, where we made Chicxulub in 72 hours with pico8. I made a timelapse of the two and a days I spent on the game. Have a watch!

https://www.youtube.com/watch?v=jTnMP0kV79U

Chicxulub is a "bullet hell" game where you play as the asteroid which wiped out the dinosaurs. There are dinosaurs in spaceships and screen filling bosses - if you're interested, you can find it here: https://ldjam.com/events/ludum-dare/47/chicxulub

I'm in the process of writing a more detailed post mortem, especially around how we managed to get the entity movement and waves set up.