Unrealted to the performance issues, I've had an issue when I tried to do the actual "level design", because making it larger than test environment broke too many things. Took 2 hours to fix it by just making it much smaller and covering with trees and interest points for the rabbits. That left me with way too little time, so I just rushed through implementing item placement, traps, win/loss, the cold and hunger mechanic, then switched some things around in order to get better performance (it was worse with original pathfinding) all within 30m, built it and uploaded barely before the deadline.