So how long is a single chapter? The game looks intriguing and high in quality and all, but I doubt I'd spend money if this is just about an hour to finish? Also, is a single chapter going to be about $20 or 5 chapters in total is going to be about $20?

When they are finished, all chapters are going to be included for the one time price of $20.

The average play time of chapter 1 is around 1 hour 20 minutes, the others will be of similar length.

Sorry, I am not sure what you mean by "one time price." As silly as it sounds, this is the first time I've heard of that term.

If I buy a single chapter now, would I have to pay again to buy the other following chapters or do I get to automatically have access to the other chapters?

Sorry if I wasn't clear. I meant to say the price for the whole game is $20, which means all 5 chapters are included in that price (but not all are finished yet). So when you buy, you will get access to all chapters automatically, as they are released.

Oh, that's what it means! Thanks for the clarification!