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Review
Erstwhile has my favorite opening line from IFComp 2018: "It was a pretty good Thanksgiving until you keeled over and died." It's funny, it immediately piques your interest, and it covers a lot of the plot: You've been murdered. Now you're a ghost, and you have to figure out who killed you.
As this ghost, you quickly discover that you have the ability to read people's minds. This is how gameplay works: After watching the detective interview the suspects, you can enter the suspects' minds. You don't have access to all of their thoughts, though - just some of them. In particular, you can access certain relevant topics that become clues. As you uncover more clues you can begin linking them together to generate new memories in the minds of the suspects and thus more clues. The game keeps track of what clues you've used and what you've been able to deduce from each successful pair of linkages, which was quite helpful for me in mentally organizing what had happened. (It's basically the same mechanic as in Color the Truth, the second-place IFComp game from 2016. Erstwhile is choice-based, though, while Color the Truth is parser.) Eventually, you can possess one of the suspects for a brief period of time and force them to confess. Unless there's enough evidence, though, the confession may not stick.
As you slowly uncover more and more of the backstory, you realize that there's more to the relationships between all these characters than appears at first - which is usually the case in murder mysteries. But I thought it was well-done how these relationships were slowly revealed as you uncovered more clues. Also, the most interesting backstories hint at part of the PC's life that he mostly refuses to admit to himself - even now that he's dead.
Gameplay went fairly well for me. I did get stuck for a while somewhere in mid-game, when I wasn't sure what other topics could be linked. I eventually started lawnmowering through the options, and that got me unstuck. However, that was the only place where I had any serious troubles.
Overall, Erstwhile is a solid murder mystery that I enjoyed playing.
