Congratulations, great little game you have here!
I know lazy players (:-P) will hate me for posting this, but may I humbly suggest the cheat mode is too easy to find out, and perhaps you could replace the "one key" with a combination (i.e. an entire word which must be pressed simultaneously, like in the old Topo Soft games), in a future version ? And this time don't let André post a public spoiler about it... XD
Cheers/Abrazo.