The short version
Three inventory items are documented for this game — Void Scythe, Raygun trophies and Sunblade knife, all obtained by redeeming codes (N3WC0D3, R4YGUN, S2NBL4D3) through Inventory → EnterCode → Redeem. No other reward source, currency or drop table exists in the checked record (site-wide check 2026-10-06).