In that first level, on the far right there's a balcony with a lip, and beyond the lip is a small floating island. It looks like the balcony and the island are the same height, but from the balcony I could shoot over the lip and from the island my shots hit the lip. That was a little weird.
I didn't play the first mode long because I have no friends.
The second mode had a thing that looked really cool (long neck) but its head was embedded in a platform so it didn't actually do anything.
The third mode was cool, curious how you plan to extend that.
The other thing was inscrutable, but it looked awesome and it sounded awesome and eventually I got the homing thing and it seemed to get pretty easy after that. Did not encounter anything that was clearly a duck, but I did collect a bunch of tiny blue polar bears...