Wow, I really enjoyed this game! I'm a fan of the stealth genre, and it was a unique take on the theme. I really liked some of the smaller details you managed to put in, like how the lobby area got more decorated for each victory and the sort-of rewind time warp sound effect. I also felt like the difficulty curve was just right; it took me quite a few tries to beat the last level.
Only a few minor grievances on my part: sometimes when traveling back up, spikes would appear overhead while traveling quickly and cut the rope before I had much time to respond (partly my fault for not having a better mental map of the level in reverse), it took a while for me to realize the spikes cut the rope and not the hook, the background music was fitting but got a bit repetitive for me, and I did not find the items/pickups to be of very much use at all after I got familiar with the hook's normal rate of movement and precision. The shield didn't seem to protect me from the things that were most dangerous to me (spikes, wall goo + spikes). Thanks for sharing your game, very fun!