Ports of Entry: Beam Software

Unknown lead platform:

Penetrator

First released for TRS-80 and ZX Spectrum in 1982.

Released for Microbee and Timex Sinclair 2068 in 1983.

 

I'd like to assume that British/Australian developer Beam Software favored the quintessentially British ZX Spectrum over the TRS-80, and there's some evidence they did, but not as much as I'd like.

 

Kung-Fu: The Way of the Exploding Fist

Released for Commodore 64 in May 1985

Released for ZX Spectrum in August 1985

Released for BBC Micro in 1985

Ported to Amstrad CPC in 1985

Released for Commodore 16 and Electron in 1986

Being a C64-first game seems likely going by the release dates and the graphics.

Bad Street Brawler

First released for Commodore 64, PC, and ZX Spectrum in 1987.

The graphics for the C64 and PC versions are uncannily similar, but the C64's palette seems more fitting.

Select chronology: 

 

Title	Lead platform	Date	Contemporary ports
Double Breakout	ZX80	1981	1981 port to ZX81
Super ZX80 Invasion	ZX80	1981	1981 port to ZX81
The Hobbit	ZX Spectrum	1982	1983 ports to various computers
Penetrator	???	1982	Same-year releases on TRS-80 and ZX Spectrum 1983 releases on Microbee and Timex Sinclair 2068
Kung-Fu: The Way of the Exploding Fist	???	1985-5	Same-year releases on BBC Micro, C64, and ZX Spectrum Same-year port to Amstrad CPC 1986 release on Commodore 16 and Electron
Rock 'n Wrestle	C64	1985	1986 ports to Amstrad CPC, Apple II, and ZX Spectrum
Bad Street Brawler	???	1987-8	Same-year releases on C64, PC, and ZX Spectrum
Back to the Future	NES	1989-9
Star Wars	NES	1991-11	1992 port to Game Boy
Shadowrun	SNES	1993-5
KKND: Krush Kill 'N Destroy	DOS	1997-7
Le Mans 24 Hours	Dreamcast	10/1/2000	2001 port to PS2