This game depends on the csfml library binaries and headers to compile and run.
On Debian and derivates you just have to install libcsfml-dev (version 2.4.x, currently available on buster/testing) which will in turn pull the libcsfml libraries as well as the original C++ variant libsfml-*.
sudo apt-get install libcsfml-dev
The rust bindings of sfml are shipped as a submodule within this repository for sake of pinning on specific commits of upstream which have yet to be published as crates. This means that after cloning this repository you have to also checkout the submodule source tree.
git submodule update --init --recursive
At this point the only thing that is left is to just build and run! Have fun tinkering!