Interesting game. At first I figured out it was possible to cheese it by standing on the middle rung and letting them pile up and get cured by proximity until the game lagged out, but then I realized you don't really get very much score by doing that. On the other hand, if you let them pile up and then harvest, depending on how dense the group of them are, you instantly die from the collisions. So it seems like there's this delicate balance of letting them pile up enough to get combos, but not so much that it kills you. Cool game!