The original Eets was a game with a new concept that took the gameplay of Lemmings and narrowed it down to one character, allowing for a lot more room for puzzle solving.
Eets Munchies, on the other hand, has you paying $7 for an iPhone style (and quality) game.
The resolution is capped in a very weird form that just ensures it was clearly built for mobile (going in fullscreen leads to big black bars on either side), and the system of "different worlds, few levels, 3 stars" that can be seen in games like Angry Birds is here.
The presentation of Eets is wonderful (even with resolution restraints) but the execution is off. Puzzles are either ridiculously easy or incredibly hard due to countless errors in timing. Think of it like the puzzles in Portal 2 compared to Portal: you understand how to set up the puzzle and you should get it done properly, but if your timing is off than your work is for nothing.
Not to mention of course that the only changes since the "beta" version were 2 other worlds, one of them being the "mystery" world, which is chock-full of those timing oriented puzzles.
Too easy, too short, and too little. Maybe buy this on iOS when it's cheaper and they plan on updating with more levels.