As this project was right after Hangry Guardians , I took a step back from designing the levels and decided to instead support the others. It was, in hindsight, a massive overscope but I proposed and completed a map editor for the game.
The system procedurally generates hexagonal tiles, knits them into chunks and into a map. It supports different textures for tiles, and blends the textures between adjacent tiles. I also created a pseudo-paintbrush that allows the designers to easily paint the textures onto terrain. The same paintbrush system is used to place decorations on the tiles (random spacing, rotation, number of decorations per type is editable). All of this and more are saved into a scriptable object that can be loaded up in the map editor or as a map in a level.
I'm quite proud of the system as it enables designers to quickly create and prototype levels. However, in hindsight the system took too long to develop, and the early stages of our project suffered because of it. I've learned that I should be more conservative with ideas and systems, lest it becomes a liability.

Guideline 1:
Maintain a steady difficulty curve, lowering the difficulty when new mechanics are introduced. Keep it generally low for the targeted causal audience, but keeping in mind that the game will be exhibited in a convention where attendees are likely gamers, add some levels with higher difficulty.
Guideline 2:
Level size has to be limited so players can easily tap the tiles offerings are on. Design within those constraints.
Guideline 3:
To keep levels from becoming too complex, use at most 2 primary mechanics (God Powers) at a time.