Creative Mode is one of the Game Modes in Scrap Mechanic. As of the current release, it is the only available mode.
Survival Mode is an upcoming Game Mode in Scrap Mechanic.
The player character is a robot maintenance mechanic, sent to an automated agricultural planet to look after the worker robots. The mechanic's spaceship crash-lands on the planet, leaving them stranded. Quickly, they discover that the Agribots have gone haywire, attacking the mechanic on sight.
The following features have been mentioned in devblogs, YouTube videos, or the TIGSource forum post.
These features have not been officially mentioned, but are strongly suspected to be a part of Survival mode.