I have released an update (version 0.1.6.111) for the demo version.
The main changes are as follows:
・Added key configuration
・Added “How to Play” (in the Options menu)
・Various balance adjustments
・Various bug fixes
If you notice any other issues or wish to report bugs, please do so via the Steam forums or our official Discord.
Abyss Ring Official Discord
https://discord.gg/XHn9MruBt