How does your submission match the theme?
Nearly everything in this game serves multiple purposes. The charging/propelling mechanic is both used for vertical movement, destroying enemies, exiting bubbles, and breaking blocks. The enemies not only act as obstacles when you aren't killing them, but also give you a small bit of extra speed and give you points and combos. Bubbles not only act as obstacles that slow you down, but also as places to gain back your air supply. Not to mention you can charge much faster in them and propel yourself even faster than usual from them. Everything works with the concepts explored in "Downwell's Dual-Purpose Design" in mind.

Third-party resources
​--freesound.org sounds (edited for use in game):
http://freesound.org/people/ramstush/sounds/232955/
http://freesound.org/people/m1a2t3z4/sounds/112213/​
http://freesound.org/people/Reitanna/sounds/332668/​
http://freesound.org/people/taure/sounds/340272/​
http://freesound.org/people/tgfcoder/sounds/146769/​
http://freesound.org/people/Alxy/sounds/189327/
http://freesound.org/people/greenvwbeetle/sounds/328119/​​
http://freesound.org/people/Sllarson/sounds/343391/
http://freesound.org/people/Glitchedtones/sounds/375925/
http://freesound.org/people/blukotek/sounds/268784/
http://freesound.org/people/ReadeOnly/sounds/186927/​
​​
--dafont.com font used for non-prebaked text:
http://www.dafont.com/pixel-font7.font

​--libGDX

--Eclipse IDE

Contributors
​Tony Wojnar--Designer, Artist, SFX Editing
Michael Wojnar--Programmer
Cason Jolly--Composer