While admiring the quality of the adaptation, I couldn't help but wonder why Namco ended its Game Gear ports with Galaga, Mappy and Pac-Man. What about Warp & Warp (aka Warpman), The Tower of Druaga or Dig Dug?
That line of thinking then led to me to ponder why some other arcade classics--like the five detailed below--were never ported to the following handheld systems despite the fact that they would've been perfect fits (or at least interesting fits) for each other.
Baby Pac-Man (DS or 3DS)--I've wanted to play this half-Pac-Man-game-half-pinball-machine oddity at home ever since I encountered it in a local arcade as a teen. I can see why it never earned a console conversion, of course, but a DS or 3DS version could've been (or could still be) magical. The question is: who would develop and publish it, Bally Midway or Namco? (My guess: neither!)
Detana!! TwinBee (WonderSwan Color)--For some strange reason, the folks at Namco only made one game, Beatmania, for the WonderSwan, and even then it was for the original black-and-white version of Bandai's niche-y handheld rather than its colorized follow-up. Why they never ported this pastel-coated cute 'em up to the WonderSwan Color is beyond me, as I have to imagine a lot of gamers would've enjoyed playing it with their portable of choice held vertically.
Dig Dug (Game Gear)--I'm sure the powers that be at Namco had their reasons for not green-lighting this handheld port, but for the life of me I can't fathom what they may have been. After all, the company's portable re-imaginings of Galaga, Mappy and Pac-Man are about as spot-on as could've been expected. (By the way, I also wish Namco had made and released a Game Gear version of Marvel Land--even though its graphics would've had to have been downsized and simplified quite a bit.)
Don Doko Don (GameBoy Color)--Don Doko Don has long had a place in my pixelated heart for all sorts of reasons, which is why it saddens me that Taito never released a handheld version. Although the GameBoy Advance could've received an arcade-perfect port, I think I'd actually have preferred to see one that was more of an homage to the original (a la Bubble Bobble for Game Gear), hence my call for it to be made for the GameBoy Color instead.
Mr. Do! (Neo Geo Pocket Color)--I don't know about you, but I think it would've been awesome it someone had brought this Dig Dug-esque game to SNK's brick-like handheld in some form or fashion--especially if they'd updated the graphics a bit like ADK did when they remade Make Trax for the system (after renaming it Crush Roller). Instead, NGPC owners were given a million pachinko simulators. Not fair!