I've never played Lock's Quest but I've heard it compared to that. From my own experience I can say its a lot like Desktop Tower Defense, and Pixeljunk Monsters. There is a lot of dialogue, but if you read it, its actually pretty funny. Like when the Mayor ask the Ninja Master how many demons there are, he brings over a "Ninja Consultant" to compute the final number.
Seriously, just give it a shot. The demo is pretty robust as you get to play through 6 levels.