During the Jam, I tested changing the timestep to 1/90, but it didn't seem to change much. Clearly I should have pushed it a little further, because changing it to 1/120 fixes it a whole ton! Thanks. That GDC talk was also super helpful, much appreciated - I increased the gravity and it feels less floaty now.
The low time intervals are definitely too hectic! But I'm glad you like the game :) Thanks heaps!