LaserBoy.exe is a 64-bit Windows application linked to SDL2.dll.

This means that the version of SDL2.dll that comes in the
LaserBoy distribution zip is the 64-bit version!

There is also a 32-bit version SDL2.dll. They are not interchangeable!

On a 64-bit Windows machine, SDL2.dll can be moved to C:\Windows\System32\

Other Windows variations of LaserBoy can be built from the src directory.
Be aware that there are 32-bit and 64-bit versions of both SDL and SDL2.

Look at the Makefiles in the src directory.

Makefile.win        builds LaserBoyXP.exe        Win32 XP and below      SDL2
Makefile_sdl1.win   builds LaserBoy_sdl1_XP.exe  Win32 XP and below      SDL

Makefile.w32        builds LaserBoyXP.exe        Win32 Vista and above   SDL2
Makefile_sdl1.w32   builds LaserBoyXP.exe        Win32 Vista and above   SDL

Makefile.w64        builds LaserBoy.exe          Win64                   SDL2
Makefile_sdl1.w64   builds LaserBoy_sdl1.exe     Win64                   SDL

Makefile            builds LaserBoy              Linux x86 PC            SDL2
Makefile_sdl1       builds LaserBoy_sdl1         Linux x86 PC            SDL

Makefile.rpi        builds LaserBoy_rpi          Linux Raspberry Pi      SDL2
Makefile_sdl1.rpi   builds LaserBoy_sdl1_rpi     Linux Raspberry Pi      SDL

Makefile.osx        builds LaserBoy              MacOS                   SDL2

Note:
Both the Linux_x86 and the MacOS versions of Makefile build an executable of
the same name (LaserBoy) in the same LaserBoy installation folder.

They are not interchangeable!

If both executables are desired, either change the name of one of them
after the compile is complete or find the line...

BIN      = ../LaserBoy

...in either Makefile (Linux) or Makefile.osx (MacOS) and change the name there
before running make to build it.

Calling

make ... clean

will delete the named BIN file (in all version of Makefile).