You could try using the 'Infinite jumping' template, which comes with C2. It would use the same principles, as the game you mentioned. You'd just need to reverse everything, so that it goes DOWN rather than UP.
You can find the template by selecting a 'New' project, then scroll down to 'Infinite jumping'.
<img src="smileys/smiley1.gif" border="0" align="middle" />