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it is a much easier fix than you think. you are not losing quality at all, you are just shrinking the visible window, and allowing the players to choose to make it fullscreen. go look at my game astrox, it has a ton of stuff all crammed in 900 X 650, but you can make it fullscreen. it does not change the resolution quality at all, it just enlarges the visible play area by moving the UI elements to the edges of the screen. i can send you screenshots of what i see here, and if you want, i will even show you the unity JS code i use to do this.
You're right!! The fullscreen button works nicely in your game. I will gladly re-use your code, rather than re-invent the wheel.
EDIT: I did some Googling, and re-invented the wheel with my own fullscreen button. :)
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never make the default game siize bigger than 900 x 650, it will not allow some players with older laptops to see everything on the screen without having to scroll, this make the game unplayable. you can always add a fullscreen button, just make sure you are scaling things based off of the screen size and not hardcoding the placement of gui elements.
I wish you told me this resolution a week ago, BEFORE I hit publish! :)
It's really tough making something in glorious 1080p, then shrinking it. That's why I had to stop at 720p. Maybe next time I'll do two versions, 480p and 720p.