If dying for the purpose of becoming a spirit is part of the story -- and the story keeps progressing from that point -- then that's different.
But if all I get is a series of choices where I either die by choosing Option A, or continue the story by choosing Option B, then the branching is pointless. The author might as well skip the storygame format altogether and write a traditional stort story.
The purpose of a storygame is that it can be read multiple ways each time, with more than one fully-developed branch (or depending on the format, with multiple ways to reach the main ending).
For the reasons that Bucky explained above, if I'm not hooked by your story on the first page, and the first choice on that page leads to an instant death, I will take that easy out, rate your story lowly, and move onto something else.
If both choices lead to fully-developed branches, I may conclude you put more effort into your story and stick around longer.