i really like the artstyle of this it's really cute, the model and animations of the cat, the ui, the ending it's great
altho im not sure if the timer above the flaming skulls is needed, it might be just how fast i completed the levels but i feel like the nine lives are good enough as a timer
about the mechanics
im not sure about the hold to jump thing, i think going for a more traditional "release to stop going up" would be better, that or just to let the cat move a bit before jumping because the stopping of momentum made the platforming abit awkward
besides that i feel like the cat corpses need a simple box hitbox so they would be a bit more reliable to climb
otherwise the levels and mechanic were very solid well done!