The first one sounds foreign because
- "See" is not the right verb for receiving feedback. Try "have" or "get."
- One does not "make" work in this context. "Making work" is a negative phrase meaning someone is making your life difficult by giving you meaningless work to do. "Do" is the right verb here.
The second one sounds fine, but a native speaker would be more likely to say "if you would give." Using the word "could" implies that you are uncertain whether the user is able to give feedback, while "would" implies that you do not yet know if they will choose to do so.
Maulik_V's suggestion of "your feedback is appreciated" is very common and natural. Speaking of morale, I think, is unnecessary. It's understood that feedback is helpful--you don't need to be personal about it. My suggestion is simply
Your feedback is appreciated.
or more explicitly
Your feedback is helpful and much appreciated.