After all these years, and growing up with Windows 3.1, I have seen an entire evolution of computers and software. Touch screens and large resolutions were a pipe dream just 15 years ago. Now it's the norm. Going from a Packard Bell (yes, before HP) that couldn't run 3D Ultra Mini...
Use your double jump to adjust your trajectory during a jump.
Explore alternative routes to bag all of the coins and track down that elusive star.
Checkpoints will allow you to restart midway through the level, so be sure to seek them out.