CS Engine, SGDK modules & XGM Driver - MIT
All of the source code not explicitly mentioned to be another license below are MIT.
The DMA queue (src/dma.c) and XGM driver (src/xgm.c, src/xgm/*) are from SGDK, which also uses the MIT license.
NXEngine-based AI routines - GPLv3
Consider all of the AI code under src/ai/ to be GPLv3.
Even in places where an AI function is entirely different, NXEngine's version was still used as a starting point.
All created by Pixel, unless specified otherwise. I used them without permission. You absolutely can't use these in anything commercial.
Music Covers - CC-BY-NC
Most of these are created by me in Deflemask and are CC-BY-NC (give me credit, and don't use it in a commercial product).
A few were remade or modified by DavisOlivier. No license was mentioned. Ask them if you want to use these in something:
- Cave Story
- Eyes of Flame
- Gestation
- Gravity
- Fanfare 1 / 2 / 3
The font used in the Title Screen menus, in-game dialogue, and crash messages was made by Sik. Ask him if you want to use them.
The Japanese font is F16. The inside of the file states "(c) Copyright 2000-2003 /efont/ The Electronic Font Open Laboratory."