Excellent game. I think the banter between Cthulhu and minion was great. I also liked using the enemy as the defense I thought that was clever.
Some things I think would have made it even better:
1. The setting, The old house just didn't scream Cthulhu to me (it certainly wasn't built strange aeons ago). Though I can understand why it was used.
2. Wings, where were his little wings.
3. Ok, so those were rather superficial, but you know what would make the game more interesting? Banter from the invading humans or between the humans and the monsters. This game has a great lighter side to it, why not?
4. It was really easy to accidentally move between areas when trying to place a guy near a doorway. This resulted in a couple of level restarts for me. Simple fix, give us an indicator of where the room switch is made.
Great game anyhow. Just a fun relaxing defense puzzle. Doesn't really leave room for a sequel but there is more to lovecraft than Cthulhu so maybe it does.
I think a well deserved 5/5 and 10/10