The waves do not have a last one.

Aim with the mouse. Clear a wave. The next one brings more grunts, then shooters, then a brute that draws a line and charges. Five hearts. There is no ending where you win. The number above is only how long you lasted.

1. Deduction Crates and a clear floor. Four bosses sleep in the corners: Witness, Verdict, Alibi, Clue. Walk into one and the trial starts. Beating it does not end the run.
2. Kiln Lava burns where you stand, and the waves come heavier. Cinder, Forge, Ash, and Coal are already in the corners.
3. Veil Mist slows your steps. Shooters hang back and fire. Whisper, Shade, Hush, and Gloom wake if you get close enough to regret it.