This game is incredible. The mechanic is so unassuming at first, but it actually has a lot of depth. Did I say a lot of depth? I meant a cubic ton of depth, and you explore it to its full potential. From the combos, to the multi-screen challenges, to the coyote time, to puzzling out the best kitty order.. Ended up playing this for a very long time trying to get 100%.
With a few tweaks and features that you've already mentioned wanting to add, plus some improved game feel, this could turn into something really special. One thing that I'd like to see is some easier ways to get back to the top on certain screens where falling down and hitting the ground updates the reset location to the bottom.
Fantastic job.