To gain more experience easily, buy squares for the first few waves, and send about 3-6 waves at a time. During the last few waves, buy as many triangle gems as you can, use as bombs, then buy more triangles (keep fingers over the hotkeys to spend quickly
Level 1 Tip: BUILD A PURPLE FACTORY LAST. The tutorial is allowed to continue after a Purple building is built. Meaning you can build 3 yellows, and those will go and spawn bots while the enemy is defenseless. After a purple is down, THEN the enemy starts spawning
Something worth mentioning. ENEMIES RESPAWN AFTER MOVING ENOUGH DISTANCE IN ANY DIRECTION, FORWARD OR BACKWARDS. This can be taken advantage of when you have a lot of health, or the enemies are weak and incompetent
T_T I miss E.W 3-5. the first two games in the series were too slow. It took a looong time to get gold relying on a tower that shoots delayed arrows...eh. Then E.W. 3 came out. The gameplay was simple, was fun, and involved a LOT of bloodshed. 4 brought along new characters, but still keeping that simple gameplay. With the addition of multiple generals that compromised the number of units you could have, but still cool. I don't remember much about 5, but it STILL had the simple gameplay. Epic War Saga was good, except I hate the whole multiplayer concept. Cuz then you start facing people who p2w, or then the point of the game is to be the best player.
TO DO MP3!!! someone in comments said to use mp3 skull...USE IT. Sometimes the site might not have your song, BUT IF IT DOES, right click, copy link address, paste here!!!
Now the notes don't appear rhythmically in time like it does for the 3 songs here, but you can still play this game to YOUR music!!!!!!
 "Castaway Troops"){kind=icon}
 "The Last Stand 2"){kind=icon}
 "Strike Force Heroes"){kind=icon}
 "GemCraft"){kind=icon}
 "Robotic Emergence 2"){kind=icon}
 "Rebuild 2"){kind=icon}
 "Warlords: Heroes"){kind=icon}
 "Realm of the Mad God"){kind=icon}
 "KingsRoad"){kind=icon}
 "New Star Soccer"){kind=icon}
 "Bear in Super Action Adventure"){kind=icon}
 "Epic War 3"){kind=icon}
 "Epic War VI"){kind=icon}
 "Party Of Heroes"){kind=icon}
 "Paladog"){kind=icon}
 "City Siege 3: FUBAR Level Pack"){kind=icon}
 "Hack Slash Crawl"){kind=icon}
 "Music Catch 2"){kind=icon}
 "Frantic 3"){kind=icon}