Yeah, I agree there could have been a lot more done to take the game to the next level. I didn't keep in mind people would have actually tried to fit to full screen and should have probably tested that prior.
It's actually a good idea that exit game should have returned to the previous page it didn't come to mind at all to program something like that.
I honestly think I should have kept in mind that it was obviously gonna be an HTML5 build and program it as a Web Game instead of a PC game.
I hope the game was still enjoyable though and thank you for trying it out!