This mission read very cleanly, not finding any major issues, overall pretty neat! Just some minor notes:

• It should probably say somewhere that the Signal Tower doesn't get activations (as it is a unit, it normally would, but I assume the intent isn't for the tower to start running around)
• "If the “Signal Tower” is destroyed or if all of the Defender units are destroyed, Attacker wins." — since the Signal Tower is also a unit and belongs to the Defender, the second clause is redundant (or should say something like "all of the Defender's other units")
• Veteran Tactics leaves ambiguous whether you need to choose one option for your whole army of if you choose for each unit individually

You absolutely nailed the 'ever-growing numbers' theme with those dynamic attacker reinforcements each round, and the defender's buffs are a great touch. I especially loved that you specified the Signal Tower's height for LoS.  However, I feel the army point recommendations for the attacker could be clearer; either a fixed total or a percentage in the attacker table would make setup smoother. 'Bring twice or more' feels a bit loose. Still, the core concept and theme are incredibly strong. Great job!

I'm getting a warning when trying to dowload this