Just hit level 50 (No Life I Know) After you get about 10+ purple minions It starts to lag the game out by putting purple lines on every area. And still don't have the stats tree maxed out at level 50. :)
It's very fun but the enemys come to quick and when you die you lose upgrades and whe nyou die at boss it's almost impossialbe ot kill him because oy uhace ot upgraded guns