i beat the game and now swirly d is on the loose (: the pain of playing on level 8 difficulty is unimaginable but I finally completed my goal if anybody else wants to attempt this here are my tips.
1. don't ever stop moving.
2. when you get to Mrs. slithers try to farm the mobs until you get good loot your happy with.
3. try to get a good spell book and a weapon with damage over 8 (my spell book was the intelligent rocks and the fireball book and my weapon was a pineapple that did 3.38 damage and a shovel that was over 10 damage.
4. last one USE THE CAR on ALL the bosses but the wasp queen the car and the spell books will be your BEST FRIEND
anyway, love the game can't wait to attempt this in the future love you fishlike and thank you for making this awesome game (: