Dead Tree Defender

Invincible:
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You know when the enemys are shooting these stuff at u Then if you 
want to become invincible and not let them attack u then do this: 
First turn ur head away from the enemys (if u are facing the enemys
then press the left key. Second duck (press down and when the enemys
try to attack u they will not hit u or you will not lose a life.


Ground level:
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Pick a point so that at full power your arrow hits an enemy on the 
top of the first ladder and remember that spot. Except for a couple
times that I fooled around, no enemy made it to the second level alive.
If you have to leave guys free to shoot you from ground level to make 
sure none of them get up the first ladder, do it. Kill them later.