I certainly wouldn't call this epic. As far as defense games go this is pretty basic stuff. I didn't find the gameplay very interesting. You start off with only one spell, and the rest of the defending is on autopilot. Kind of hard to get invested in such a situation.
It takes a lot of skulls (or "sculls", as they're called in the game, for some reason) to unlock more spells, and in attempt to stock up for it, you waste opportunities to upgrade your defenses. I get that these are "RPG mechanics", but why does it have to take so long to get an new spell? The gameplay is just so dull at the start, getting something else to do than click repeatedly.
A game like this works best, if you give the player more distinguishable rewards frequently. Sure, I can add cauldrons of hot oil, but how does that improve the gameplay? It doesn't. I'm doing the same thing over and over again. Give me something to look forward to.
The art style is nice, and the music is good- until it loops incessantly, and is recycled for every level. But work on the gameplay some more. It's just isn't very interesting now.