This screenplay will touch upon more and deeper psychological issues than most viewers are able or ready to explore within their own psyche. Hence, reviews such as, "it fails to consistently engage with its most interesting ideas." I.e., one's inward journey into their own psyche is of little to no interest for the average person. And... that is precisely why the Earth is full of problems caused by human infestation -- to quote V-ger (ST:TMP).

Movies addressing psychological issues and motifs are gaining traction in the movie industry, and can make quite a profit -- such as Barbie.

For the rest of us who are open to considering what lay beyond our inner limitations, this is an absolutely wonderful movie, perfectly juxtaposing innerspace with outerspace, and the cyclical dichotomy of the end being the beginning, at multiple levels. The direction and editing establish an absolutely perfect pace for the premise of solo space travel and introspection, analogous to Silent Running (1972). The set design is remarkably plausible.

Last but not least, this is the best performance by Adam Sandler since Punch Drunk Love (2002). And the irony in this movie is that when Sandler overcomes whatever issues keep him from taking on deep and serious roles -- in a manner similar to the character he plays in this movie -- he is absolutely amazing in revealing the gift of his own personal depth.

(Minus one star for psychological issues not written by, or without consultation of, psychology experts.)