Note this is an early version that still has some debugging enabled (on-screen output) and is unfinished. I wrote this code in 2002 and just recently found it on a burned DVD at the end of 2019. I've started to clean things up a bit, but still need to primarily fix how the shooting works and add more levels.
I have included everything you should need to build it on Windows NT based operating systems.
After cloning the repo, unzip all files within \bin\devkitadv\ so they end up in c:\devkitadv\
Run \src\make.bat to build main.gba
Run main.gba in your emulator.
To get "GBA Map Editor Beta 4" working on newer versions of Windows:
Download comdlg32.ocx and copy it to C:\Windows\SysWOW64\ (for 64 bit Windows).
Run from elevated cmd: C:\Windows\SysWOW64\regsvr32 C:\Windows\SysWOW64\comdlg32.ocx