Tough game! I like the execution though :)
Would be nice if the price of each upgrade would show up on the wall, so the player can purposefully save for a specific one they want. Clicking on the upgrade button also does the job, but it takes a lot of time to get otherwise pretty important information.
The bad umbrellas don't really look bad, they have a pretty orange color! Bad umbrellas looking a little battered or crooked would help with intuitively understanding that those need to be removed I think...
The atmosphere is great, really feels like I'm inside a factory where I shouldn't be, or where not-so-legal things happen, good job :3