There is an updated pull request by pbindle against master on the void-packages repository

https://github.com/pbindle/void-packages cavestory
https://github.com/void-linux/void-packages/pull/43690

cavestory: fix unwritable save
The save file is always located in a file called `Profile.dat` next to the executable, but since that is installed, normally, in a root owned directory, when someone tries to play the game it wouldn't save because it couldn't write to the file (although the game provided no error message). This change just adds an empty `Profile.dat` with 666 perms.

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A patch file from https://github.com/void-linux/void-packages/pull/43690.patch is attached