S+ Tier

Investment BankLate-game ScalingSlow early but 12 total upgrades at reduced cost. Once maxed, this is the strict best late-game engine. Levels 1-4 feel brutal - survive them and the economy explodes.

S Tier

Powerhouse BankEarly-game Burst+152% generation out of the gate. Penalty: +60% upgrade scaling and +115% deploy cooldown at high levels. Wins the early game but bleeds cash flow late.

A Tier

Default BankBalancedGenerates 1 Cash per tick. Upgrades boost tick rate by 0.5 and cost +25 Cash each. Baseline economy - never optimal, never terrible.Detonator BankSpeedclearPassive income is disabled; enemy bounties are massively boosted. 60-second self-destruct timer - upgrading resets the timer but accelerates decay. Lose if you cannot afford the reset.

B Tier

Ignition BankBuff EngineNegligible income. Upgrade fills a decay meter that triggers a map-wide allied Walkspeed + Attack Rate buff. Hurts reinforce cadence, rewards already-strong units.Blood AltarSwarm CounterDisables enemy cash bounties. Kills fill a Blood Meter spent on autonomous projectiles and friendly Blight summons. Niche but devastating on swarm stages.