YES YES YES Thank you for changing Sphinx!! That just bought it a 
increase in rating from me. Yes, with that one change, it is now one of the best levels I've seen so far in the packs. (Played through parts of all but Giraffe so far.)
I also have to agree with jbdude55 that More Mini Puzzles was great, as was Mini Puzzles. Really, there are quite a few great levels here. I also greatly enjoyed Colony II, Shooting Star, and Badlands, among many, many others. Unfortunately I had the same experience with Upstream as you had with Slide of 25 Trials.
JB, I have a few voting-related questions:
1) If I see a level that looks like it's meant to be a lesson level (meaning it has a title and hint that introduce a basic concept) but I think it's too difficult to be a lesson level, but it would make a great teens-20s level, should I rate it for a teens-20s slot? (According to your instructions, I think the answer should be "yes".) And if the level makes it in and is deemed too difficult for a lesson level, will its hint and/or name be removed or changed so it isn't redundant by that point in the set? (That's the only reason I am concerned about treating it as a post-lesson level while voting.)
2) What do I do if I encounter a level that has (IMHO) one glaring poorly designed or unfair spot late into the level that makes it a
or level, BUT that one flaw is easily fixable and changing it would make the level or worthy? (Sort of kind of just exactly like Sphinx.) Is this topic the right place to make fix suggestions for levels like this? Ordinarily, I might try to contact the designer, but since the levels in the packs are anonymous and I don't know what set the level in question comes from....
3) If it's not too much trouble, could you please number the levels on the voting pages? As I was playing, I took notes in the form of level numbers and star ratings, but not names, so putting in my votes entails either translating numbers to names using the score screen or very carefully going one at a time down the list trying not to miscount.
Finally, a couple of minor "busts" (not sure if they are really busts) to report:
In "Aych Two Oh" (Cardboard #6) you can easily bypass the chip socket, which is quite silly given that the level's one chip is right before the socket.
In "Order of Operations" (Flouncy #22) I found that I could solve it with only one block. (No, I didn't even need either of the two blocks in the exit room.) Is this intended?
increase in rating from me. Yes, with that one change, it is now one of the best levels I've seen so far in the packs. (Played through parts of all but Giraffe so far.) I also have to agree with jbdude55 that More Mini Puzzles was great, as was Mini Puzzles. Really, there are quite a few great levels here. I also greatly enjoyed Colony II, Shooting Star, and Badlands, among many, many others. Unfortunately I had the same experience with Upstream as you had with Slide of 25 Trials.
JB, I have a few voting-related questions:
1) If I see a level that looks like it's meant to be a lesson level (meaning it has a title and hint that introduce a basic concept) but I think it's too difficult to be a lesson level, but it would make a great teens-20s level, should I rate it for a teens-20s slot? (According to your instructions, I think the answer should be "yes".) And if the level makes it in and is deemed too difficult for a lesson level, will its hint and/or name be removed or changed so it isn't redundant by that point in the set? (That's the only reason I am concerned about treating it as a post-lesson level while voting.)
2) What do I do if I encounter a level that has (IMHO) one glaring poorly designed or unfair spot late into the level that makes it a
or level, BUT that one flaw is easily fixable and changing it would make the level or worthy? (Sort of kind of just exactly like Sphinx.) Is this topic the right place to make fix suggestions for levels like this? Ordinarily, I might try to contact the designer, but since the levels in the packs are anonymous and I don't know what set the level in question comes from....3) If it's not too much trouble, could you please number the levels on the voting pages? As I was playing, I took notes in the form of level numbers and star ratings, but not names, so putting in my votes entails either translating numbers to names using the score screen or very carefully going one at a time down the list trying not to miscount.
Finally, a couple of minor "busts" (not sure if they are really busts) to report:
In "Aych Two Oh" (Cardboard #6) you can easily bypass the chip socket, which is quite silly given that the level's one chip is right before the socket.
In "Order of Operations" (Flouncy #22) I found that I could solve it with only one block. (No, I didn't even need either of the two blocks in the exit room.) Is this intended?