Thanks for playing and the feedback!
We've heard about the sliding a lot so it definitely needed to be a higher priority.
The vertical screen transition idea is an interesting one. We built the level screens to be pretty binary with the transitions so you're definitely in either one room or the other, but that got a little difficult with vertical transitions since we still wanted a limited jump height. We might explore slope transitions between vertical screens (at least some of the time) to allow players to more easily track the transition.
Thanks again!