Hello! I'm the Linux developer and I'd like to help you.
First, you should be running the game by executing the run.sh file rather than the rwia executable directly.
Second, you will need the SDL2 image libraries on your system. Assuming you're in Ubuntu, you can install them by opening a terminal window and typing
sudo apt install libsdl2-image-2.0-0
If you have further problems with missing libraries, try searching the name of the library online to find the command you should use to install that library. You should only have to install them once.
Please let me know if you have further questions!