It's a mistake on my behalf. Due to a serious time crunch, we were not able to complete sufficient testing. Once the rating period is over in 6 days from now, I'll be able to fix it.
Until then, if you run "sudo apt-get install g++", "sudo apt-get install libsdl2-dev", "sudo apt-get install libsdl2-ttf-dev", "sudo apt-get install libsdl2-mixer-dev", "sudo apt-get install libsdl2-image-dev" in the terminal on linux, it should work.