Yeah, I've a note in the comments about the enter key. If you've clicked off the screen at all before hitting enter, it doesn't register. The downloadable version is fine, though. In the pet upgrades menu, you can buy the pet upgrades with the 'bone' points, not the munchies, so maybe that's why it wasn't working? Or if you're referring to the actual 'buy pet upgrades,' it doesn't work until you've bought your first pet. Regardless, I need to add some tutorials and better instructions for all of it, for sure!
Thanks the feedback and rating :D