I agree with the comment below regarding tutorials since I did get rather confused at some stages, but this is definitely an interesting concept! Great job doing what you did in 72 hours, especially as a solo dev :)
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I think the third stage definitely stumped me on my first attempt - on the second stage I believe it's supposed to teach you that you don't want any of your gang descriptors to be different (?), but I didn't really get that message and I got past stage 2 just by simply guessing the correct combination (since it was only two masks), leading to me getting stuck on stage 3. I understood it the second time I tried it but the hint felt rather vague and was quite easy to misunderstand or skip past.
The fourth stage was also rather confusing and the hint was really vague. I also think simply changing the color to green isn't enough of a visual indicator that the mask was clickable unless you happened to hover your mouse over the guy. In the end, I got the solution by trial and error and didn't really understand why the solution was correct. Afterwards, the rest of the game just turned into trial and error since I didn't feel like I properly understood the fundamental concept behind what needed to be masked.