Cool
I found little cratches in the boss battle so i could kill him. Here is some ideas:
Upgrades for all weapon *Pistol turns to Magnum, Rifle turns to MG/AR, Bat turns to machete, HOLY !@#$ turns to arcane Pull/Push would be together, and would turn to gravity gun PushLV2 and PullLV2* Grenades, flares *attracts zombies* Armors and Helmets, Perks *Speed, Damage, Spread, Penetration, Money Gain* And all theese would be locked but unlocked and buyable through campaign.