This is a Ludum Dare #33 Entry

This is a reversed tower defense.

Spawn monsters with : C, V or B

C - Demon's child - Ground unit
V - Sky's doomer - Flying unit
B - Hell's sniper- Ranged unit

Spawning monsters costs Energy

Energy refills when no monsters are alive
Ennemies life recharges when no monsters are alive

Energy you spend gives you XP, when you gain level you can buy an upgrade

You can upgrade attack health and range of your units