Than you for playing the game.
Yea, we talked about it as a group and decided if we did have some more time, we would add a way of tracking which wave you are currently on and such.
In the current state of the game, there are 10 waves. each wave starts with regular ducks and then top hat ducks. So one way of seeing is when the duck type changes.
I do recommend trying to reach the boss though on wave 10, as it is a challenge to beat.