Wow, this is a huge game for 2 weeks of development. Well done! Unfortunately I wasn't able to get past the "kill the beast" objective, probably on me but I couldn't for the life of me figure out what to do. Enjoyed it up to that point though!
The intention for the "Kill the beast" objective is to drag the Reactor core (Big green ball) outside to the elevator, clear the goop on it, and go down. (But that is the last objective, so you basically completed it.)