Try messing around with levels to get really short or really long cycles, or try beating levels with less barriers/bounce, that can keep you busy for a while :) I kinda like going for really long cycles because they tend to have barriers in really odd positions, where you'd not think it'd work at a first glance. For example, this is a 31.4 second cycle of the first level: https://www.youtube.com/watch?v=aR5xkyLL_D4