My Tips Would Be:
- Abuse the pause button.
- Max the Skeletons and Puddle of Beast development trees first.
- Never quit a level even if you are losing, crank it to 4x and take the XP.
- Build lots of Puddle of Beasts (max them out)
- Upgrade the graveyard to get 3 Skeletons. Just need to slow down the enemies so your Puddles can mow them down.
A circle is a shape with infinite sides.
A polygon is a shape with a finite number of sides.
Therefore a circle is not a polygon.
Regardless who cares. This game is fun.