Hi @Omineus
Thanks for trying Share for Review; however, based on your description, it sounds like you're sharing the actual project file to edit (a feature called Invite to Edit).
If your goal is simply to share a version of your project to get comments back, you should use Share for Review which will share a simple rendition (no layers!) for your reviewers to easily digest the artwork and give you comments.
Go to File > Share for Review, name your review and then share it by either adding email addresses or copying the link to share. Let us know if this works for you as expected.