Coming from a vibrator in the ass, this is hardly comforting. (without offence, of course).
An example of a serious and pragmatic developer can be found in 395games, the game in question being MIST.
Ren'Py, a small masterpiece, one person.
And by the way, "this" is a fucking teaser, it's not even a demo.
post: DEMO;
A demo is a limited version of a game that allows interested players to try the game before purchasing it.
It means, for the uninformed, that it is the limited version of a Game Already in Full Development Phase.
At least in my house, that is what a DEMO means.
EXAMPLE:
Bright Memory Infinite
FYQD-Studio, One Person.
A couple of years ago, DEMO was running on both PCs and Android Devices. (Simply, Bright Memory)