add health
Add damage and kill to heroes
Add projectiles
Add window.Physics
Tick projectiles
Use time base animation for projectiles
Update flying object
Oscillate flying heroes
Create cannon.js
Link to cannon.js
draw cannon
Create background.js
Add graveyard
Link to background.js
Draw ground and graveyard
Make canvas bigger
Delete map_creator.html
Delete map_creator.js
Create items.js
Hide some items if there are over 10 in the list