The sheer amount of references to other entries is insane, great job :D
It took me a while until I discovered that there was a setting to zoom out. At first I thought something botched the resolution or viewport because so many things were off screen (including some tooltips), but it seems this was somewhat intentional. I would've loved to zoom out a little more, and perhaps binding it to the scrollwheel would make this more useful as well.
As for the game itself, it's pretty fun! There's lots of things to choose from. I reached round 7 a few times but my best run was reaching round 8. There's a nice balance in finding ways to get rich, get points, and get more guns. But it feels like some runs are just doomed to fail if you can't get the scaling you need early on. But that's always a risk with these infinitely scaling games.
Anyway, great stuff! :D