There has already been a GBA game released in Japan and/or Canada..but that's the only game I know of besides those that you can play on Cartoon Network.com.
I personally liked the 1st Mad Mod episode better than the 2nd, though they were both pretty funny. I always enjoy watching the 'Chase' in each of them, and hearing the funny music background from The Beatles/Puffy Ami Yumi.
It's Silky, not Silkworm, if I'm not mistaken.
Silky's adorable..in a bug-eyed, mutanty sort-of-way xD. After that 'Can I Keep Him?' episode, you almost allways see him. He always happens to appear in the 'funny' moments in the Tower.