Interface size. A new button in the top bar cycles the HUD between 100%, 115% and 130%, and remembers the choice. Everything scales with it — stat readouts, tower prices, upgrade nodes, the wave list, the hover cards.
This one comes straight from a review: the print size was called out as hard going for anyone without 20/20 vision. That is a fair complaint, and squinting is a poor thing to ask of someone playing fullscreen. Thank you for saying so.
The same review mentioned tooltips being slow to appear — those were replaced with instant ones in the previous update.
No balance changes.