Gang Wars is a subpar beat 'em up with a stat upgrade system.
Even though Satoshi Hagitani had long left Alpha Denshi by this point, their signature message can still be found starting at address 0x00070 in the audio CPU:
Sound Board No.62FC01 Music Macro Lungeag & Effect Macro Lungeag & Adpcm Voice Out Control Program ALPHA DENSHI CO., LTD. By Satoshi.Hagitani
The Japanese version has Japanese voice acting and Japanese text. The "World" version has Japanese voice acting and English text. For the US version only, new voice clips were recorded in English. They're not very good.
The sign that appears at the end of Stage 3 was changed in the US version.