Hi - if you're using Godot, there's an option on export to embed the pck file in the executeable, which will allow people to run the game without having to download both files. Alternatively I'd recommend putting both files in a zipped folder to ensure only a single download is required.
The game was tricky, but I got the hang of it after a while. I'd recommend slowing down enemy projectiles, or making it a little more obvious when enemies are going to fire to make it a little easier to dodge bullets. Trying to save civilians as they ran screaming through combat was a nice use of the limitation!