Bigger max limits for stats are needed. With all vet gear and around 200k level monsters I couldn't spend my gold fast enough even with an autoclicking script.
http://prntscr.com/49cb0q Why is there such a huge difference between the level in the top right and the level in the bottom left? And I presume that's why the monsters I'm fighting are highlighted in red right?
When I get the crossbow, make it the crossbow that is used with the space bar. First rule of Shneiderman's "Eight Golden Rules of Interface Design", Strive for consistency. Keep the melee for the mouse click permanently.
About upgrades, how about making it something like this: After buying the Little Umbrellas upgrade, it changes to Novelty Straws and so on? It not only keeps the list short, it's easy to max out the upgrades for an industry when one has gone far in the game.
Just changed it!