Pieuw, I finally solved Piquant 3 (see replay) . However, I didn't use the kaywhyn trick and I didn't use the climber skill. So I think this is a backroute. I’ll be curious to know the intended solution. For me, this is the hardest level in the pack.

This is a backroute indeed. If a solution requires such frame-by-frame "messy"skills assignment, you can safely assume this isn't what I intended Nevertheless, well done! You found a working solution and it's fine.
I really don't think this level is that hard, the intended solution is easy to execute and doesn't require any hard trick. It may be hard to figure out though

I didn't think there were so many backroutes in my solutions. In fact, as you specified that the progression curve was not "smooth", I wrongly thought that the difficulty was quite random. So, I wasn’t surprised to find rather easy levels in the last rank, and vice versa. Indeed, some levels in the first rank seemed quite difficult to me (Prosaic 7, Prosaic 8, and especially Prosaic 10).

The levels are ordered by ranks which are meant to get harder and harder. I just sorted them pretty quickly based on my perspective only so this is why I said the difficulty curve may be bumpy. Also, the first rank gets a bit hard very quickly because I didn't really make easy levels except for the first two.

My solution for Piquant 10 is therefore a huge backroute! It took me many hours to solve this level. Again, I would be curious to know what the intended solution is. It was, with Piquant 3, the level that was the most difficult for me to solve.

False Happiness requires a very specific trick to be solved. You didn't use it so your solution is a backroute but this doesn't mean this is a bad solution. You got many things right, too! I'm impressed you spent hours on it, I hope it didn't drive you crazy!

Would you like me to send you replays to these levels (Piquant 3, Piquant 10, Pompous 7)? Maybe more?. Or would you prefer some clues to try and solve them another way? You can PM me anytime

The following levels have been fixed to prevent David's backroutes. Since then he solved all of them as intended, which is neat but I'm sure some backroutes still remain

Posh 03 - Second-Hand Wonderland
Posh 05 - Swim Swap Swoop
Posh 09 - Bridges in the Sky
Pedantic 04 - Land of Confusion
Piquant 05 - Satanorium
Piquant 07 - Forbidden Friendship
Piquant 10 - False Happiness
Pompous 01 - Emeraldpunk 5047
Pompous 02 - Rickety Business
Pompous 04 - Deus Ex Machina
Pompous 06 - Itinéraire Touristique
Pompous 07 - A tad mad, a tad rad!

I updated the attachment in the first message.

I played through the pack and here're my solutions

Pimolems was one of the very first level packs I played after I joined the forum and started playing custom levels. And I'm glad that you are still around at custom level scene.

I think I found the intended solutions to most of the levels with a few backroutes.
And for some levels, I've found multiple solutions:
Posh5(2), Pedantic1(4), Piquant3(2), Pompous4(2), Pompous7(2)