Played it through another time. Definitely smoother experience now.
The balance is off at the end. Most of the game it's fine, with a decent (though fast for the genre) progression. However, towards the end, once you start getting 100k-200k money for a run, it explodes, and very quickly you're sitting on millions and can buy a ton of upgrades at once.
Selling many at once is a little cumbersome. There's not too much you can do about looking through all of them to see which to sell, though the hover text works well (gender would be nice on it, though). Maybe a small area next to the Meadow could help with a sell-all button. Probably don't want a sell-all on the Meadow itself, since that stops it from being useful storage. Could also do a shift/ctrl click. Not sure what the best option is.