What a cool entry! I love the theme, you kept it simple, yet I really feel like a rocket engineer. This is definitely one of my top games of the jam!
The only issue for me is that dragging and dropping a lot gives me carpal tunnel, so I had to quit after level 3. If I could click to pick up and put down parts as well as drag & drop, that would be a huge help for me personally.
Another bit of polish you could add is a launch animation when you do everything right, and an explosion animation when you make a mistake.
Overall very well done, great entry!