Mouse button - fire
Spacebar - fire / next level / restart failed level
M - mute music/sound
R - restart level

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Currently experiencing some trouble with scoreboards.
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Puzzle/physics game Kostka lets you take control of small square affected by physics. In each level (out of 30) your objective is to push the square to the goal.
There is just a little catch. You don't have full control of where the square goes. Hold your finger/key/button and release it when the time is right! Try to make as little number of moves as possible to get all the stars.
Game is controlled entirely by one finger, key or button depending on what you play it at.
Can you beat all levels? Can you beat the boss? Can you get all the stars?
Can be played at touchscreens.