Thank you for the commend!
You are right. I focused on the programming part of the game, so the assets were all free from MarketPlace. The problem was that they didn't support Nanite because they used masked materials, and I couldn't change Unreal version to 5.1 in the middle of the jam (my error to not begin working with that version). I also didn't have time to work on the LOD's and my partner (the one who made that fantastic map) could only work a couple of days on it. If I expand it (I don't really know if I will), I will be making the assets in Blender, so they will be a lot less heavy.