For a first time game jam, the game is relatively well done, considering you didn't fully finish it, so well done. There are things to improve sure, but you get there with experience.
For example with the stealth, you already made one sign at the beginning so maybe a second one before the factory which would tell you how the stealth works would be nice, like a small tutorial. Export errors happen and if you are not used to game dev, they can catch you unprepared, so don't worry about them here and learn from it.
If I could recommend one thing about the errors, that Chloe recommended on the discord as well, couple of hours before the end of the jam, maybe even just 1 hour before, create a test build and upload it to a draft version of the project so you can catch these errors before you need to submit the final project. This way you can also test the game on the site itself a discover bugs that don't appear in the engine or wherer you create the game.