You need to make it save my cannon position. It gets very frustrating to have to re-position my cannon on each retry.
Besides that - Great Job! Another fun physics game!
Also, are the monk and high priest really the same? In the unit hiring stats (on mouseover) it says they have the same stats, the only difference is the high priest says "advanced healing unit"
in regard to everyone complaining about the limited gold level - it's not so bad. I beat it on my first try with 680 gold left. Use high priests and mace men.