For my game Refactor I was planning on charging a minimum price that increases as I complete more of the game. Once someone has download access to a game, do they retain download access forever, or is their download access contingent on having paid more than the minimum required at the time?

I guess it makes more sense that once-downloadable-always-downloadable would be the norm, since that would also allow for sale pricing and so on, but I just thought I'd clarify to make sure I'm not doing anything silly with this plan.

(What I want to do is entice people to buy earlier rather than later, so if they buy now they should always retain access to it later on.)