Write down your design pillars. This is the foundation of your game and should never change. Your whole design should tie back to these pillars.
The overwhelming excitement of being able to build anything.
Thrill of the Unknown
Excitement, dread and tension of exploring the unknown. No idea what dangers/rewards are down there.
Uncontrollable outburst of emotion, fear, irrationality, laughter, weeping, etc. FTL style chain of "oh sh!t" dependencies, where a failure in one system can affect others, until you're suddenly in trouble.
<aside> 📚 What are design pillars? https://www.charliecleveland.com/game-pillars/