There is no enemy and you cannot cast anything...
I just checked. Looking for enemy (skeleton) might take time, but he is on the map. Try force change the world by pressing "z". After a few attempts, the randomness will place him where you can find him. Once enemy is visible, arrows and magic should work.
In the worst case, try restarting your game.
Apologies, but this is just a prototype to test changing world map.
