doukutsu-rs initially started as a Rust learning project, but eventually evolved into semi-playable and compatible reimplementation of the engine of Cave Story - a great indie game created by Studio Pixel.
The project aims to deliver a decent alternative for the original engine, improving it with features such as multiplayer support and independent framerate (so the game runs at original speed and looks smooth regardless of monitor refresh rate).
NOTE: This flatpak has a workaround that makes it so you can use your own data files and it does not ship any by default.
NOTE: The default data files directory is under $XDG_DATA_HOME/doukutsu-rs/data
. That being $HOME/.var/app/io.github.doukutsu_rs.doukutsu-rs/data/doukutsu-rs/data
by default.