Throwing Mass at the Problem

In case you see the game is cropped,  use the fullscreen button.

Totally ran out of time to finish this (bad prioritization and wasted some time), so the gameplay is only barebones, 

An asteroid is coming towards Earth and the only hope is launching a spacecraft big enough to deflect it! So big, in fact, that it needs multiple rockets to even assemble it in space. You are given an empty lot that must be turned into the world's premier spaceport in order to complete the mission!

Controls
The gameplay consists of building and managing the spaceport.  Building requires placing launch pads and connecting them to the propellant storages (at the bottom of the field) at the bottom and top. Note that connecting pipes that carry different propellants leads to them mixing up and being rendered unusable. They can only be removed and reinstalled. Connecting the launch pad to two different propellants allows to put a rocket on it and start loading it. The process takes several seconds, after which the rocket can be launched, getting closer to the target goal.

Build menu has 4 buttons:
Click "Pad" to place a launch pad on the field
Click "Pipe" to place pipes for propellant on the field 
Click "x" to start demolishing the things you've built
Click cursor to switch into selection mode

When in selection mode, you can click on a launch pad allowing you to place a rocket there (if there isn't one already) and launch it (if it's already full).

Used non-store assets:

• Radio tower by Poly by Google [CC-BY] (https://creativecommons.org/licenses/by/3.0/) via Poly Pizza (https://poly.pizza/m/d1zYJG7rJGY)
• Space Kit [CC0] by Kenney (https://kenney.nl)
• Water Tower by Alex Safayan [CC-BY] (https://creativecommons.org/licenses/by/3.0/) via Poly Pizza (https://poly.pizza/m/9JYqZyTiVkU)
• Water Tank Floor by Quaternius (https://poly.pizza/m/xgsh3kWbAM)
• Orbitron from FontSource (https://fontsource.org/)