[1] SNAKES(shareware demo) appeared on The One Amiga coverdisk B (Issue 59, Aug 93) [downloadHERE].
[2] ***SNAKES(full shareware release)*** is freely available for downloadHERE. [Source: EAB FTP site]
[3] More info. about the game can be read in this EAB thread.
Go to the options set-up screen and make sure only one orange ball (left of keyboard) is showing. Repeatedly press the CTRL key until the screen flashes green. At the very least, you should now have unlimited lives and the ability to skip levels using the HELP key.
[Source: clenched, HOL super contributor]