This game seems unfinished. It doesn't end when the Poachers' tower reaches 0 HP, and it doesn't send out any units of its own.
Author Comments
Defend your tower from them pesky Poachers send out your army to defend your tower.
CapybaraManYT responds:
the short description says its a demo a demo is not a full game
I have also not even coded the end of that level or the enemy units