I'm playing it alone so it is very difficult. :P
The idea of having two players with different roles is an interesting one, and the magical abilities are a nice touch, but I think having the game be split-screen takes away from the overall experience a bit. Especially when it comes to keymapping and controls. Using U and I (inverted) to rotate the camera is a bit clunky, and the lack of rotation on the x and z-axes along with the split-screen makes it difficult to see where you're going or what's ahead. Seeing as this was a game jam though, I get the decision.
On the other hand, my first impression when starting the game, seeing the menu, setting, animations, dialogue etc. were very positive.
A week isn't a long time to develop a game, and I definitely think this is something you should keep working on. With a bit of polish to the controls and combat, it could turn out great! Overall, well done! :)
Also, keep in mind that I haven't tried with 2 players (the intended way, I presume), and I might've had a different view if I had.