i couldn't find the happy ending in like 40 mins, and it's definitely bugged somehow with the window grill. It doesn't install it, even if i don't change it. Pretty good concept and presentation anyway. I've had 'fun'.
edit: guess after 'Try again' not all the bools are set back to default somehow. There are remaining changes from prev playthrough. Reloading the page, though, solves it.