Our Garden Month 1

This year Brad and my dad tilled up an area for us to garden, and then built a fortress around it to keep out the varmints!  So far so good other than the moles, or voles I don't know which it is.  Any advice on keeping those out?

 This is how it looked one month ago.

 And this is how it looks this week.

 Our garden crew who is really excited about the progress.