Made it to level 16. Probably not gonna get any farther this run. Built my entire run around the Ring of Doom (+2 Dmg to adjacent/diagonal for 1 mana) and Hatchets. Worked really well, though now the damage numbers needed are scaling faster than I can keep up. Not to mention that Magma Core hates block. =P
Cheers on the great game! Looking forward to buying it on steam!