You have to use int1.Value instead of int1 to pass the int to iTween.
So instead of:
iTween.ValueTo(go, iTween.Hash(
"from", Int1,
"to", Int2,
Do this:
iTween.ValueTo(go, iTween.Hash(
"from", Int1.Value,
"to", Int2.Value,
Not tested here, so there may be other issues, but that's the one that jumped out at me reading the code...