I made this in a day and half as a challenge and design exercise for myself. I basically wanted to take metroidvanias and distill them to their purest form.
I'm posting it here just to see what others think, so please let me know!
You can find more of my quickly-made games at damiansommer.tumblr.com
WASD or Arrows - Move & Jump
M - Mute/Unmute
The songs I used can be found here (In order of appearance):
We Look So Pretty Today by SkyLabrynth: http://bit.ly/o6drTt
Kraid (Metroid) by Random: http://bit.ly/n5jOmj
The Gears Go (Castlevania: Portrait of Ruin) by greatspaceadventure: http://bit.ly/pNScVs
Geothermal (Cave Story) by ZeroPass: http://bit.ly/oo1tPA
liczhaus wpizdu by mellow-yellow: http://bit.ly/oLgbIl
All songs used under Creative Commons licenses.