Copyright (c) 2014 Gaëtan Renaudeau

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,
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Afterimage · Ghost Portraits
Original game code: Copyright (c) 2026 SkillSafe app contributors.
Original game code is offered under the same MIT terms above.
Game artwork: generated using OpenAI's built-in GPT image generation tool.

This original game uses the actual Bezier Easing ES module, unchanged, from:
https://github.com/gre/bezier-easing
Commit b2ef4763387f54f4108506772f09a5ed6833b496 (2026-10-24).
Observed 1,781 stars on 2026-10-30. MIT license retained above.
Bezier Easing provides the motion easing used by every spirit path.
The upstream repository is a library, not the source of the original game.
No source or artwork from rejected candidate games is included.