Haha glad you found 1 of the 2 James May easter eggs. A friend of ours wanted us to put James May in the game so we did.
As for the ufo in the sky, we had a sound cue start every wave. Perhaps we'll also try adding bigger lights to the ship! Thanks for the suggestion.
We experimented with allowing the cheese to be thrown further but we found it became too easy and only started being challenging by wave 5. The cheese was intended to only reach the ships when they are attacking the cows and not simply roaming. But we'll see if we can make it more challenging while allowing the player to shoot further.