I actually have a lot of questions about these. Is there an etiquette to standardisation similar to crosswords? As an example, if a solution is an abbreviation the clue should contain an abbreviation? (there are no abbreviations in this current crypto)
I feel like if two of the clues in the puzzle can be solved, the third can be used as a validation, sometimes literally giving that Aha! moment. I thought long and hard about your cryptoalien. As soon as I saw Wilson's answer, I knew it had to be the answer in hindsight.