Game is now broken. It is not the site. Other site's version is broken too. Same thing with other browsers. and the SWF file alone has the same result.
One thing that would be fun would be a ratio bar. What i mean by this, is that for certain element of the game, you could chose the exp you want to make vs the coin you want to make. Of course, not change the ratio to 200% exp and 0% coins. But maybe this could be balanced by a loss of value. Meaning that someone with a lot of coins could just make 50% coins while he makes 150% exp allowing a bit of a faster progress in your current objective depending what it is.
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That's an interesting idea, but it can be very difficult to balance. Besides, Coins can already be converted to EXP by purchasing Insta-Progress.