Some day I'll get past day 5 or so. Every time I try, I get a little bit further, but the balancing is fairly out of wack past day two :P
2000 units to craft an upgrade is a lot to ask of the player! On top of limited stamina, increasingly rare ore spawns, pricey quota items, and zombies that might prevent you getting home that run! But the gameplay loop is too compelling, I just keep playing...