This former shareware game was found here:

http://dscho.com/fruit/

This game requires amos.library, it's included in the archive. copy
libs/amos.library to LIBS: then run the game.

License as described by the author: "feel free to use / redistribute / etc
however you like.", see:

http://eab.abime.net/showpost.php?p=851537&postcount=10

AMOS source code available aswell, see game/misc/Kumquat_src.lha

From the original readme of the demo version:

Kumquat is basically a clone of the fantastic C64 game, 'Zolyx'.  You need to
fill a certain amount of the screen without getting hit by one of the enemy
dots.  I know it doesn't sound any good, but  it is very addictive.  It was
recently distributed on the cover of Amiga Format (summer 96 sometime, I
forget which issue), and some very nice things were said about it in the
magazine.

Requirements: Will run on a basic A1200.

PERMISSION  UID  GID    PACKED    SIZE  RATIO METHOD CRC     STAMP     NAME
---------- ----------- ------- ------- ------ ---------- ------------ ----------
[generic]                  229     420  54.5% -lh5- fdbb Sep  2  1992 Kumquat.info
[generic]                87400  138044  63.3% -lh5- d6fc Sep  2  1992 Kumquat/Kumquat
[generic]                 3148    3148 100.0% -lh0- e291 Sep  2  1992 Kumquat/Kumquat.doc
[generic]                  280     612  45.8% -lh5- eaf6 Sep  2  1992 Kumquat/Kumquat.Doc.info
[generic]                  276     442  62.4% -lh5- c221 Sep  2  1992 Kumquat/Kumquat.info
[generic]                28912   46948  61.6% -lh5- 624f Sep  2  1992 Kumquat/Libs/amos.library
---------- ----------- ------- ------- ------ ---------- ------------ ----------
 Total         6 files  120245  189614  63.4%            Feb 15 13:24