Nice visuals, art, and animation. The gunshot sound effects feel crisp and punchy, and I like that there are subtle variations in the gunshot sounds instead of the exact same clip repeating each time. That small detail adds a lot. The overall WW2 vibe comes through strongly.
I wonder if a turn-based mode could be an interesting twist to experiment with. For example, imagine each wave includes a medic, and the player has to choose between pushing forward aggressively or pulling back to save wounded units. That kind of decision-making could add a cool layer of tactical tension.