Really love the concept, there's a lot of room for growth here! Only main complaint is the controls. The space + arrow thing is a bit tricky and the "p" key is out of the way. 

This looks like a great start for something. The enemies not attacking or defending makes it a little too easy and there doesn’t seem to be any strategy between choosing which character to attack with besides which one is in the same space. If you added some other attacking rules (i.e. melee vs ranged) or something like a triangle weakness system it could be much better. Great job!