@freshadow, for the obvious reason. Making a good AI is very hard. Also flash is not optimised for calculation heavy processes(Like AI), so it would easily bog the game down.
Is the heroic efforts award achievable?
I can't see any map that starts with enough gold to place a hero, so winning with only heroes seems impossible.
Vesperbot, it's possible to dodge the stones that you get in your head on 3-3. That should bring you to single loss. How on earth do you do 3-2 without a loss?
The reason the tower sways "even when solid" is that it is not solid. It's composed of blocks. Those blocks however are acting like springs. When a block lands on an other block the blocks in question gets visibly compressed. That compresion gets distrubuted through the tower, and unless the tower is perfectly symetrical this distribution is not even. So the tower starts to sway.
There is a trick to level 18. By shooting down you get enough speed that it's possible to go over the last wall, rather than trying to go past under it.
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 "Battalion: Vengeance"){kind=icon}
 "Falling Blocks"){kind=icon}
 "Level Up!"){kind=icon}
 "The Company of Myself"){kind=icon}
 "Huje Tower"){kind=icon}
 "Cargo Bridge"){kind=icon}
 "Protector III"){kind=icon}
 "Open Doors 2"){kind=icon}
 "Spidergame"){kind=icon}
 "Apocalypse"){kind=icon}
 "SeppuKuties"){kind=icon}
 "Mytheria"){kind=icon}
 "99 Bricks"){kind=icon}
 "Factory Balls 2"){kind=icon}
 "Splitter"){kind=icon}
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 "Kaleidoscope Reef"){kind=icon}