Themes
We used unconventional weapon and you are the environment and they were absolutely awesome themes. It definitely encouraged some out of the box thinking and made for some interesting brainstorming sessions.

Tools
I used Godot which was admittedly frustrating with how often it broke seemingly by itself but it was nonetheless a learning opportunity.

Lessons
I learned a lot about the limitations of controlling things through animation players (its a bad idea) and that simplifying an idea is not always making it any less fun.