Interesting idea.
I think that showing the next moves of the boss would make the game more interesting, as you'd have to strategize where to move next. Some ideas on how to do this:
1. you could use something similar to "onion skin" in animation programs, where the boss is shown as transparent and in a different color in his next position.
2. You could have a little board on the side of the screen that shows the next few positions of the boss.
Anyway, good job, keep developing and practicing :)