Got round to finishing the game
You can play it here:
http://goo.gl/AjyTss
Hope you enjoy.
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Use your sonar to navigate through the pitch black environment,
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[Keyboard Controls]
WASD / Arrows - Movement
P - Pause
F - Fullscreen
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[Gamepad Controls]
Left stick / D-Pad - Movement
A - Jump
Start - Pause