using "checkpoints" instead of "autosaves" is either a poor choice of words or an unfortunate choice of for the game. not that autosaves aren't problematic, too.
DRM thing is a bit confusing. Sounds like the 'base' game is DRM free, but the promised second location (Berlin) requires DRM, as well as future content from the dev or the community. But the DRM-free version is only for backers. When the game is released for everyone, there will be only be the version with DRM on Steam (or iOS, I think). Can't be sold on GoG or anywhere else. Considering it was pitched as a DRM free game on Kickstarter, I can understand why people are upset. At the same time, people seem to miss the point of Kickstarter, and that pledging is a gamble. Technically no one is entitled to a refund for their pledge; this is good will (damage control) from the dev.