Silly ultimately to it’s detriment. As a comedy it’s just not quite funny enough and as a SciFi film it gives way to too much sillyness to pull it fully along. As a Woody Allen film it’s certainly in the more ambitious and perhaps special of his ouvre but not one I would quickly return to.
Inspired story, filled with literary and cinema references. Still can't but feel Woody's early humor often comes out as forced, amusing only the author himself. Somewhere near the end you can sense him slowly wrapping up his work on slapstick and moving towards a gender-based neurotic screwball(-ish) comedy he will later excel at.
To me, this was the first film where Allen finally figured out how to mesh anarchic gags with a coherent story; his previous films were nice but were a bit too gag heavy. This is the strangest and weirdest movie he ever made, but it's quite brilliant. It's too bad that he never made anything quite like this again.
At its best when it's at its silliest, transporting Woody Allen's schtick to a sci-fi setting initially looks inspired. Then it becomes less sci-fi and more like just another of Allen's relationship comedies. From that point on it doesn't work so well and just feels unusual and not in a good way. Still very funny in places, however.
Here's my issue with Mr. Allen's style: everything is a punchline. Seriously, watch the first scene in which his character begins to talk and observe how all of his dialogue have him say something that's meant to be humorous. While it can occasionally lead to a funny line, it takes away any naturalness from the delivery. On a positive note, the Marx brothers influenced moments were better handled and more inspired.