Finally!!! After lots and lots of tries I managed to win! Here is my strategy: 0. MOST IMPORTANT: When The End gets in your range press ASDF and right-click! This will trigger a glitch that makes you autofire. It helps A LOT. 1. Dont waste your mana on dragons unless it won't slow down your angel summoning! (Like if you just summoned an angel and still have about 3000 mana, then it's ok to summon a dragon too. Otherwise you'd better save it to the next angel.) 2. Use the hoobit+elf rush that was mentioned before! Do it by tapping 1 and 2 furiously!
If you want to earn A LOT of EXP do this: 1- Maximize your arrows and your trap; 2- Pick any level (for best results pick level 14. Don't pick level 15 because you have to face a very hard boss); 3- Hold A,S,D and F and then click outside the game (this will make you autofire all 4 arrows); 4- Aim the arrows so that they will land a bit farther than the middle of the arena; 5- As you gain mana start increasing your mana pool; 6- As soon as you get 1000 mana build the trap and aim the arrows at the trap; 7- Continue to increase the mana pool until you get 9999 max mana 8- Go watch a movie or something like that; When you get the exp you want press A,S,D and F to stop the arrows and start pressing all unit creation buttons and let them finish the enemy castle. Rate this comment up to help the people who need exp.
here's the best units:urangutan,succubus,weretiger,valkrie,elfsniper,sylph
heroes: Popo the epic dwarf, Viegraf the red, Cassandra the queen
spells: shield,timestop,phoenix