MONKEY BUSINESS was reportedly the very first commercial game ever released for the Amiga, and was published in late 1985 by little-known U.S. software company The Other Valley Software.
Whilst many Amiga gaming icons and enthusiasts alike believe that MIND WALKER - coded by Bill Williams and released by Commodore in early 1986 - was the first commercial Amiga game ever published, at least one or two pioneers involved in the Amiga's infancy contend otherwise.
MONKEY BUSINESS and DELTA PATROL - released for the Amiga by The Other Valley Software in late 1985 - were, in all probability, the first two commercial games ever published for the platform.
Indeed, MONKEY BUSINESS and DELTA PATROL were reportedly released shortly after the Amiga 1000 began shipping in the U.S. in September 1985, with MONKEY BUSINESS being the first game received for review that year by the world's first Amiga print magazine Amiga World.
'My candidate [for most obscure Amiga game] is Monkey Business from The Other Valley Software.
It's a Donkey Kong clone released in late 1985--the first game Amiga World received (I was AW's games editor) and, quite possibly, the first Amiga game, period.'
[Source: Peter Olafson (ex-Amiga World games editor), "The Most Obscure Amiga Game" online thread (23-Feb-2000); comp.sys.amiga.games newsgroup]
'Over the years, Mind Walker has acquired a beard of myths that have gained credence through repetition. Like most myths, they contain a grain of truth. But only a small grain.
Mind Walker was not the first commercial Amiga game. Although among the earliest Amiga games - and probably the best distributed of them (owing to CBM's participation) - Mind Walker wasn't actually released until early 1986, when the Amiga had already been available for some months. The earliest commercial Amiga games I've been able to find are Monkey Business and Delta Patrol - both from The Other Valley Software and released in late 1985.'
[Source: Peter Olafson (Amiga games journalist), A Tribute to the Work of Bill Williams: Part 1; Amazing Computing, Vol. 13 Issue 2 (Feb 98), p46]
 Currently, no disk image of MONKEY BUSINESS - that is, a scene release or an original release of the game from the publisher - is available on the internet.
 Photos of the original game box and disk of MONKEY BUSINESS do exist, however, and are available for viewing HERE (see Miscshot).