I think the problem is 1. either you didn't actually extract cityglitch.love or 2. that you don't have the "lovegame" folder in the right location.
1. What you're downloading from the download section at https://mindfungus.itch.io/cityglitch is not a FOLDER , but a FILE called cityglitch.love. You cannot directly use it that way after downloading. Using your file manager app on the phone (on Samsung devices there is a "My Files" app) you must FIRST rename it to cityglitch.zip and then extract its contents as you would a ZIP archive. Find a way to extract a ZIP on your phone - probably it should work through the built-in "My Files" app.
The contents of CITYGLITCH.ZIP are the folders "cities, data, puzzles, stages, steam, util" and a bunch of .lua files which should all be moved to the "lovegame" folder - see below.
2. Note: The path "/sdcard" does not necessarily mean an actual SD card - if your phone does not have one inserted, it means your phone's internal storage instead.
On a Samsung device, you should use its "My Files" app, go to "Internal Storage" and make sure the "lovegame" folder is one on the folders in there. That means it's one of folders besides Download, Movies, Pictures,...
Note: It has been a while since I have used a smartphone with a SD card slot - in case you do have a SD card inserted, then probably in "My Files" app you should go to the "SD card" instead.
Here are some links for further troubleshooting:
https://love2d.org/forums/viewtopic.php?t=81466
https://love2d.org/forums/viewtopic.php?t=94313
https://love2d.org/wiki/Getting_Started (see the Android section)