You are the Kraken...
...all 4 of you.
Each player controls a tentacle. Use your tentacle to do tentacle-y things. Cooperate to destroy as many ships and blimps as possible... or don't.
May the best tentacle win!
Sebastian Andary did the technical heavy-lifting (ie. tentacle physics). I did project management and gameplay programming.
I made the music. It's very... minimalist.
I also made the coffee. This is often called "game design".