Were I to be completely honest, having spent a bit of time with both, I'd probably rather play Flytrap than Spelunky. But I'd probably not bother playing either again for my own personal enjoyment.
Adam C, you might be right in that less hype will ensure that more of the people who DO buy the game will actually appreciate it, but I'd still wager your over-all sales will be far less without the hype.
