Interestingly, you can choose to play entirely with the mouse. You can move and fire by dragging the pointer around Naija, while right clicking brings up a series of icons incorporating a gesture mechanism you can select states and powers from. For example: right click and swooping the mouse through three icons on the left of the circle will switch you to the first new persona: a gothic black version of Naija who can fireball enemies.
Not that this is a violent game. Things attack you and you will need to fight, but we spent most of our time sweeping Naija through underwater caverns, just enjoying the movement and rewards of exploration: every new cavern comes with an impressive background or new creature to spot. But that openness can be a hindrance too. This is a huge game, but the alien backdrop, multi-directional movement and rather unhelpful map means you will get lost. Some of the objectives aren’t particularly well thought through either: they’re of the “you’ve done this, now go all the way over here and put this in the thing” variety.