"flate" is a compression issue - how do you create your ZIP file?
Please consider using 7zip.org
Now you have to look at code errors, have you used the tool to check your syntax? https://sellaroli.com/apps/nem-translation-tool/
when you use the Sellaroli tool errors will display with a red warning square in the margin!
There are a few issues that happen with files: did you unzip the whole kit to work with the files (you cannot upload a password-protected zip)? did you recreate the game.zip file when you changed the sprites? did you remove the unzipped game folder from your files? did you make sure you didn't have several subfolders in the main zip file?
There is a game.zip file inside the not-enough-time-LocJam-103.zip file - it contains among other things 1 image which is part of the game's plot. You don't have to unzip it, but you will need to write around it (in reference to the album title in t[196]) although that wouldn't get in the way of finishing the game.
When you zip up again the main folder let's say [not-enough-time-LocJam-103], the first folder you see should be [not-enough-time-LocJam-103], and in it are the game files - if there is any other layer it will break the game.
PS: if you keep having issues please consider making your game files available so I could look at them directly!