Pretty neat game, spaming kinda alot... howabout removing the cooldown and instead make it a matter of regen? atleast on your main dmg spell or something.
Buyable items(bought by gold, earned by killing enemy-units) having influece on your mages stats (like cooldwon reduction, manaAmount, manaRegen etc. would be great for the follow up =))
Bug i found: if you cast fear right in the moment an enemyUnit enters to get to the next lvl of your castle, obviously on the right floor, the unit disapears for your spells, but not for your guards.
Your guards can't kill em, they still do dmg (like laying bombs or hitting guards) however, the Level finishes without you having to kill those invincible units
Gl and hf making Epic Stand II