Hey! Thanks for playing and for the feedback. I hope despite the bugs you still had some fun :)
I was trying to understand what was triggering the resource nodes bug but couldn't figure it out, so thank you for pointing it out. The upgrade one was just some very very bad coding on my part and I've already fixed it for a post jam patch. The fire freezing the game (which now that I think about it is very ironic) is probably me not loading resources properly. I've really struggled with performance in all of my games so far...
For the levels, leveling up increases your damage and max health, but that is not clearly communicated. I'll try to change that to give a better feedback to the player.
For the progression, because the game has no story and just a single map, I agree that after each day it can feel like nothing really changes. You can try to scale your character faster than the enemies and see how long you survive, but that is it. Enemies gain more health and damage the more time passes, and they spawn more frequently. The current version has a very slow start, but after 4 to 5 days things can get out of hand.