My personal faves from the original project (in alphabetical order) are below:
- Flight of the Navigator 
- Forbidden Planet 
- Her 
- La Jetee 
- Seconds 
- Spiderman: Into the Spider-Verse 
- The day the earth stood still 
- The Fly 
- The Man who fell to earth 
- The Thing 
- Twelve Monkeys 
- Westworld 
Check out Rotten Tomatoes Top 150 list to see the best Science Fiction films of all time voted by critics and the general public. It’s updated all the time, so is the most recent list.
And here is the Timeout Top 100 sci-fi list that sparked this whole project.
To see my current watchlist, check out the below. Have any recommendations? Mention it to me on the contact page!