Do i need to link my game here at the community?

Or is it ok to not do it and just wait for the submission to end and 

If you want you can share it here, but all gamejam entries should be visible once the submit period ends.

You can share it here if you'd like to invite people to start playing it early. I linked mine in another thread somewhere, but I'm just trying to be active in this community and don't want to feel like I'm spamming it.

You don't need to link it. You see the tag next to our names that say "Submitted." You can play other's games if you click on it. That is only limited to those who post in the community, you would still have to wait to play the ones where the developer did not post anything.