Bubble + is a remake of Bubble Ghost, a rather interesting puzzle/arcade game made a few years earlier. This version has better graphics and sound effects while the rest of the game is pretty much the same. Here is the review of the original game that can be used for this "remake":
You are aware that ghosts exists, aren't you? And you do know what their purpose is, right? You don't? How come? Who do you think blows all those bubbles, eh? You should ask the elders, they know all about that! Err... sure. Anyway, Bubble Ghost is a weird and fun arcade/puzzle game. You, as a ghost, have to move a single bubble through 30+ rooms in a castle of some kind. You can move through anything since you are a ghost after all, but the poor bubble will pop if it touches anything. The first few levels are fairly easy, but most of the game is quite challenging. Do your best and make it through all those levels. Nice thing is that you can practice any room you want at any time. Lovely!