Ants Fun Pack is a stand-alone game with over 100 all-new Ants levels. These are in general easier than Ants/Ants Pro, and you can play any level at any time (you don't have to do them in order). Even though the levels are easier, you'll be challenged to get 4 stars on all of them.
For more info, see the original Ants game.
Install the free channel to your Roku account; you can later upgrade to the paid version within the channel. Or purchase the ad-free channel now. Either way, you'll get the same content/features.