Id be interested in seeing where the project has to go from here though! Maybe you could tie the drug mechanic to the players ammo or health? or maybe the more drugs you take the less accurate your character becomes or certain parts of the level become wonky or weird such as visual hallucinations that might end up in you shooting someone whos surrendering or accidentally doing actions that are dirty. The action of using performance enhancers themselves shouldnt make you dirty but maybe they make it harder to make good decisions, yknow decreased accuracy means you might accidentally shoot a civilian etc.
I do hope you find some time to work on the game because it is genuinely an interesting take on the gameplay loop of hotline miami.