My real name is Andrew Minton. I play Crawl very frequently, but usually not online. I submit many vaults, and am working on more almost every day. Coming up with ideas for vaults can be difficult; if you have any, please suggest them in this forum thread.
The game mechanics should be much more transparent, perhaps entirely so.
Too much emphasis is placed on flavor and it hurts gameplay, especially transparency.
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Areas that prevent the player from leaving them (Pan, Abyss, labyrinths) can be horribly tedious, should come up with a better threat. Abyss is especially bad here since you don't normally enter it voluntarily.
Areas that prevent the player from using interface enhancements (Abyss, labyrinths, Shoals) are bad for the same reason.
Extra lives (felids) are completely inappropriate for the game and should be removed. Felids themselves are fine in other respects.