The files in here come from www.glitchthegame.com.

License here: http://www.glitchthegame.com/public-domain-game-art/#licensing

All files are provided by Tiny Speck under the Creative Commons CC0 1.0
Universal License. This is a broadly permissive "No Rights Reserved" license —
you may do what you please with what we've provided. Our intention is to
dedicate these works to the public domain and make them freely available to all,
without restriction. All files are provided AS-IS. Tiny Speck cannot provide any
support to help you bring these assets into your own projects.

Note: the Glitch logo and trademark are not among the things we are making
available under this license. Only items in the files explicitly included herein
are covered.

There is no obligation to link or credit the works, but if you do, please link
to glitchthegame.com, our permanent "retirement" site for the game and these
assets. Of course, links/shoutouts to Tiny Speck (tinyspeck.com) and/or Slack
(slack.com) are appreciated.