Do you have to finish the game in one go?

[Andrew R]

Or is there a save system?

Also the purpose of the demo for free game? :P

[PokeTSL]

The purpose of the demo was as a teaser, plus completing it before April 1st allowed for your name to be in the credits!!! The game mainly has flags as checkpoints but there isnt a manual save feature. If you alt+f4 it would save your location

[Neverknow247]

there is a save system. When you close the game you will start where you left off