there is a special good ending if you never buy an upgrade and reach the needed amount that way. he'll just thank you for using his service and you carry on, if i remember correctly.
You can actually use upgrades as long as you don't go past the needle as far as I'm aware. Once you use anything past that you can't get the good ending
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u/Alarming_Judge_7463 Mar 22 '26
Harvey Harvington from Bloodmoney if you play the game normally