weapon upgrades vendors and money colleting

[Đeath’ş Aļļ | Horst Fuchs]

Do I need to buy all upgrades? Are early ones available in later levels too? I skipped upgrade in second level cause it looked meh and expensive (1500 - had 2000)

Where am I getting money? Game didnt explain that. I dont remember i found any in levels, but still i have some.

[Nuclear Sorrow]

yes you get early upgrades in later levels as well