Solve this simple Zipper Cipher

This is a very simple variation on a very simple cipher. I'm sure one of you geniuses on this site will be able to figure it out without any hints (aside from the title). I encourage you to use a computer to solve it, but that is ultimately not necessary.

Here you go:

Xwj wdwzq sklqgv, bzmjm qk sv micst ifl whxgaabw jmsklqgv.

• I believe any cipher question should have indication (maybe some cleverly hidden hints) on how it should be decrypted. – oleslaw Sep 12 '19 at 14:04
• I haven't hidden any clever hints, but I think what is here is enough for anyone to solve it in a reasonable amount of time. I'm sort of planning on using this kind of thing as part of a future puzzle, so it really isn't terribly complicated; this is sort of a test run though so I'll drop a hint in several hours if necessary. – rm-vanda Sep 12 '19 at 14:11
• tips on improving for future use are appreciated~ – rm-vanda Sep 12 '19 at 14:49
• If you are looking at suggestions for improvement, I would suggest looking at what Gareth went through to solve the puzzle. It is rather labor intensive with no obvious path from question to solution. Is that how you expected someone to solve this? If not, how would they know your intended mechanism? How might you lead readers to that mechanism in the question? Calling it a "Zipper Cipher" doesn't help much as there is no standard definition for this and even if someone guessed the meaning they might reject it due to the inclusion of spaces in the count but not the encryption. – Barker Sep 12 '19 at 16:24
• Hey, I don’t know if it helps but if you have a look at my ‘nature walk’ puzzle I tried to tie the cipher into a story, through which the key was gradually hinted at, and it seems to have been well received. It was really no different in difficulty or task than yours, it was the ‘hidden hints’ (as oleslaw said) that did it I think. – Tonks Sep 12 '19 at 16:28