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...
Go for the Space Tiffin on every level, for you'll get extra points and a power boost.
Focus on the green and red blobs - those are the ones you need to kill to finish the level.
You can shoot the triangular walls that get in your way.