A nice twist on the standard tactical RPG formula that makes use of the DS touch-screen to draw runes. It has a Japan-only Wii sequel, Takt of Magic.
Use the following Action Replay code with the US/EUR Version and load a save while holding Select. A menu appears, with the different endings and all the events from the game. To scroll down the list, use the D-Pad.
A4000130 FFFB0000 0209487C E1A05000 D2000000 00000000 94000130 FFFB0000 0209487C E3A05017 D2000000 00000000
There is a set of three unused mugshots, which appear to be low resolution. They do not have any used better quality version. One is obviously a placeholder with Japanese writing on it (ヤミ "yami", i.e. darkness), but the girl design differs from the one used in the final game.
This is one of the used mugshots for Isaac, for comparison.
Isaac, and an early version of the girl but with her having grey hair, have also a set of leftover early battle graphics, along with some for little mook monsters. They seem to be very incomplete, lacking the motion lines, in-between frames and other details.