Haven't played many FPS jam entries so it might be me but the game felt bit over ambitious. The graphics do look nice but since they are very detailed, they also make the loading times bigger. And that is something you might want to consider when making a game like this. After the first cutscene I thought the game froze since there was no indication of loading happening.
Objective wise I would've liked a journal or some tooltip on menu to tell me where to go again, because I was having a hard time reading the small print in the corner. I was also focusing on the controls so I might have missed my time to read there. Either way, some clear indication of objective would have been cool.
For action, there were features lacking I was expecting to see in a shooter. First, headshots. I was taking my sweet time to aim only to see it not having any impact what so ever. Which leads me to the second point, lack of feedback. Most of the time I had no idea whether I had hit the mark or not.
Lastly, I wasn't able to reload my guns for some reason.
Either way, I think you did a fine job pulling all the pieces together. For future I highly recommend putting your game in more accessible format and on a known platform if you want others to play it. Downloading from a google drive is very dodgy business.