This project was the first time I had ever worked in Godot, so I faced a lot of challenges just by nature of starting with a new engine. One thing that really got me stuck was the enemies. For whatever reason, I was really struggling to get them to take damage and react to the player at all. 

Fortunately, in my next project, Escaped Experiment, I was tasked with creating the enemies. After some similar difficulties I got it figured out, and eventually implemented a working state machine that I coded mostly from scratch!