Since the contest started, I've been posting developer tips in the contests channel on Discord. I've decided to post all those tips here and any future tips. I hope contestants can take advantage of these tips to make the best games possible.
Make your game have high replay value. If the game is short with a single goal and when the goal is reached the game is over and there is nothing else to do then that's very low replay value. Make a game where even when the main goal is reached, you can still play the game more and have fun doing it.
Using the herd feature you could generate mini monster camps by making the herd spawns be things like fire pit, tent, monsters, treasure. With the right mix of random probability you can have little mini monster camps spring up all over your world with random chance of treasure or unique items. If you make your static objects have nav mesh obstacles then they will be properly navigable after spawning on existing baked navmesh. I haven't tried this yet, but seems possible.
You could also spawn an entire prebuilt camp as well, but getting the elements to fit to the terrain could be challenging unless you have a custom script on them to snap them to the terrain when they spawn.
Now would be the time to evaluate your progress and consider whether or not you need to change the scope of the game to finish it in time. Technically, you should have a fully playable prototype by this date and should only be polishing and playtesting. If you're not at that stage then you should consider reducing the game's scope. If you're not at playable prototype today then try to get there by June 3rd at the latest. That will give you time to playtest, fix bugs, and polish things.
Also, if you haven't tried to build a stand-alone executable yet, you should do that right away. Some assets have issues when building stand-alone and you may not be able to make one that works without fixes.