Yup that's because we forgot to write the controls in the game description... it's Tab or right-click ^^' I agree it's not intuitive, when you say "make it work like normal games" what kind of control where you expecting? (specifically for the "go back" / "zoom out" control)
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If you're capturing the controls correctly for the major browsers then tab should be fine, it's just not something I'd think of trying :(, it doesn't work in most web games (because you have to disable the built-in browser controls). Same with RMB - it's annoying when web games break the browser so they can use RMB, and very few do it well (also: works badly on a lot of laptops, so most devs don't use it any more).
Standard for 'go back/out' is escape - and doesn't have a special meaning in browsers.
Most games I've played have an on-screen button for 'back' or 'exit', so there's no problem. I'd say 9 in 10 games have an onscreen button, whether or not they also have 'esc'.