I like the idea, but the lack of healing and sending the player immediately back to the start makes combat encounters unforgiving. This paired with the fact that the player feels pretty slow doesn't make replaying early sections feel very good and makes them drag on. That said, I think the idea is interesting, coincidentally one of our original drafts was a concept of a game that never progresses past the tutorial, so I think it's really cool to see that executed.
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I disagree, it would help to make the player feel like it was their fault they died yes, but even still it wouldn't justify the punishment of going back to the start especially if there's no way to speed up the process somehow. Ideally, when a player gets sent back to the start, you want them to be able to use their knowledge of the game to advance faster, but it feels like you advance at the same pace every re-attempt.