Again, there's not much in
Bubble Bobble: Double Shot that you haven't had a chance to see in the previous games. A few tweaks do make it a slightly different game though. Bub and Bob, the Green and Blue dinosaurs, are joined by Bubu. They blow elemental bubbles, and you'll have to switch between them to take out certain elemental enemies. They also determine the power-ups you can get during boss battles, adding an element of strategy, but not a big one.
The main game is entirely controlled by the regular controls, not the touch-screen. As mentioned before, you are given unlimited continues in the form of mini-games. Complete the mini-game, and you are given a continue. These games are very easy, and after a while, they're just repetitive tasks that take you out of the game.
I really am baffled by the lack of any kind of save system though. Even the NES game gave you codes as you advanced through the levels, so at least you could jump ahead if you picked up the game later. You'll need a whole lot of time to sit down and complete this game if you're not a super-player, and even then, you'll probably wish you could just take a dang break and turn your DS off every once in a while.
In the end this is Bubble Bobble, the cute, but often frustrating platformer that you remember from years back. Marvelous Entertainment played it safe here, to say the least. Without a simple single-cart multiplayer option, and with no save feature at all, it's hard to recommend this title.