P.S. If anyone's keeping High scores, mine was 56

Thanks for playing! You're right, I really need to add some instructions to the game page.  I could also add an instructions button and panel to the main menu.  So, when you kill a monster, they drop a power up.  This power up increases your movement speed, the bomb size and gives you one extra bomb.  I didn't have time to break power up into three separate ones, the way Bomerman does, so just put all three into one.  I'll give yours a go next.