[OT] - Convert SDL2 Linux Game Into Stand Alone Linux Executable?

Hi,

We have a new SDL2 video game for Linux.
Current version is a compressed ZIP file.
In ZIP is resources and source code which is built with a makefile.
Would it be difficult to make a stand alone Linux executable? (like AppImage?)

Game uses the following libraries:

SDL2
SDL2_Image
SDL2_Mixer
SDL2_TTF

Game can be downloaded below.
Let us know, thanks!

Jesse