Controls are smooth, the lore is interesting, the characters are cute, I like it! The grappling hook mechanic takes a while to understand but wrapping your head around it feels great.
(Minor level design spoiler below)
My biggest gripe yet is that some environmental hazards are not very visually distinct. Maybe that's just me, or maybe that's on purpose, but I got caught all that time in spike traps, and sometimes hot air vents too.