I like the idea and I am always way more down for a dark story than some dating sim or shooter. The art was excellent, however what bothered me was the monologue. I liked the emotional idea, but the delivery left a bit to be desired. Most glaring were the cliches and an over abundance of obvious similes. To be honest, I cringed through almost all of the astronaut's thoughts. I get that you aren't Proust but I think some in depth editing for cliché and repetition would have done you some good.
Good concept though, I just suggest you rework it; perhaps reimagine it.