There are no tap in cheats that we know of for this game, but here is a little trick to help you gain some extra experience easily while playing as the Wizard.
OK, first of all get ytour butt over to the Imperial Palance level. Near the end you should fins a room with loads of red monsters. The good thing is that these guys are really easy to kill...So just keep shooting away and watch your experience increase. Try using the Patch of Sky attack from the center of the room for max effect. If you have auto fire... Even better
When you are done just collect the Magic Key and move on.