It gets more difficult with the later levels but I was able to consistently beat all of them so it just takes some practise. I'll add an exit button with the last build though. Thanks for the feedback!
I'd suggest making it slightly easier to play, because this way it'll be more fun for all of the players, and I don't think spending more than 20-30 minutes in a game like this one is reasonable or should be expected of anyone (unless you add extra features or decorations/small details that make the game feel rich). Thanks for the response though, and great to hear you're listening to feedback and continuing to improve this title!