is the downloaded version a program or a local browser page? the biggest annoyance I'm having with the demo is that it stops progressing if it's not visible on the screen (yes it keeps working if only a small part is visible but finding a way to keep part of 4 different windows visible while working in a 5th was kind of annoying) but most stand alone programs do not have that restriction in my experience so it'd be worth the 3 dollars to have that issue fixed if nothing else
also would be nice if you could import your multipliers from the demo to the main game at least if there's problems creating a full save export for some reason