Thanks for the feedback! Yes, regarding checkpoints, we want to add that mechanic once there are more levels. Starting with version 0.9.9, when Yoki falls into the abyss, she teleports back without having to restart the level. As for sliding along the edges of blocks—we’re aware of the issue; it’s not an easy fix, but it’s one of the problems we want to address, and we hope to fix it in upcoming updates.