Wardstone Quartet is a revival of "Elematter" by Jack Rugile (c) 2014, MIT licence.
Source: https://github.com/jackrugile/elematter-js13k  commit b7c4c0a9e06446a9afacbd605ea1efb0ae3433ae

Credit: Elematter by Jack Rugile, (c) 2014, MIT licence. Sound synthesis based on jsfxr/sfxr by Thomas Vian (Apache-2.0). Revived for Eracade.

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Original licence text (LICENSE.md in the source repository)
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The MIT License (MIT)

Copyright (c) 2014 Jack Rugile

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.


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Third-party notice carried over from the original
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The original bundled jsfxr (SfxrParams, Copyright 2010 Thomas Vian, Licensed under the Apache License, Version 2.0,
http://www.apache.org/licenses/LICENSE-2.0) to synthesise its sound effects from sfxr parameter lists.
This revival does not include that code or any audio file: its sounds are made by the Eracade kit synth. The
notice is kept here because the original sound design and its parameter ideas come from that lineage.

Changes made for Eracade: the map is turned a quarter turn for portrait screens, input is tap and keyboard based,
the game runs on a fixed 60 Hz step with a seeded random generator, wave 15 now includes its air boss (the original
wave table had a typo that dropped it), the score is new, and all sound is replaced.