Proving Grounds: How High Can You Get?

how_high_can_you_getRecently I’ve been spending some time in Proving Grounds, desperately trying for that 30 waves on Endless Damage achievement.  So far the highest I’ve gotten is 17, which I guess isn’t terrible, but I MUST have this achievement!  I want to prove to myself that after all these years, Auntie Pike has still got it.

Have you tried Endless?  How high can YOU get?

P.S. Who else loves the original Donkey Kong?  Sometimes I’m actually okay at it.