Hello there. 
It's a tower defense game, but you are playing for other side. 
So. You can't lose, but you can win :) To do it, you only need send 100 monsters to the town. 
The town will be busy with building towers. 
Controls: 

• ESC - go to the menu. You can start from zero here. Probably bugged :)
  
• WASD or arrows - move and select upgrade (in one day, you'll be granted 4 upgrades)
• E - charge graves with your dark (orange in reality) energy. Charged graves (and a pumpkin garden if I finish that in time) will produce monsters.
• Pumpkins can destroy towers (and your army)

In the bottom left corner, you can see town's money. More monsters are killed - the more money the town has, the more towers it can build.

Bottom right, - monsters in town. You need 100 to win.