This former shareware game was found here:

http://dscho.com/fruit/

This archive contains the AMOS source code plus a few lines of 68k assembler
for the screen updates. 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

PERMISSION  UID  GID    PACKED    SIZE  RATIO METHOD CRC     STAMP     NAME
---------- ----------- ------- ------- ------ ---------- ------------ ----------
[generic]                66687  109734  60.8% -lh5- 7e9d Sep  2  1992 Kumquat_Src/Kumquat.Amos
[generic]                  379     766  49.5% -lh5- 0a5f Sep  2  1992 Kumquat_Src/KumquatDots.s
---------- ----------- ------- ------- ------ ---------- ------------ ----------
 Total         2 files   67066  110500  60.7%            Feb 15 13:24