* Code *
by Peter Kosyh
Some levels: Andrew Lobanov
Attribution-ShareAlike 3.0 Unported

* Graphics *
by Peter Kosyh
Attribution-ShareAlike 3.0 Unported

* Music*
CC BY-SA 4.0
http://freesound.org/people/sergeeo/sounds/176402/
http://freemusicarchive.org/music/RoccoW/~/Weeklybeats_2_-_Daniels_Kruis
http://freesound.org/people/peepholecircus/sounds/169991/
http://freemusicarchive.org/music/RoccoW/~/Weeklybeats_5_-Ive_Got_Nothing_1969
http://freemusicarchive.org/music/RoccoW/~/Weeklybeats_4_-_All_Will_Be_Well
