I've seen a couple games with this concept (Build the rocket on a time frame), but you definitely added something unique with the physics-based pulling of parts. Struggling to build a stable rocket while having to slap together scrap parts is really interesting. I was a bit frustrated losing parts if they weren't connected, and the fact that clicking on a connected part reset it, rather than just letting me pick it back up. That being said, adding a simple restart button so you don't have to watch the full launch before trying again would help this a lot, and the art style is super unique.