Apparently it's just a draft of the final release, so now it's how it is.
I'm sure dB will release it on Bandcamp when it's done. Also Steam Store page says:
Quote:
This is the award winning soundtrack for Crypt of the NecroDancer, created by Danny Baranowsky! This DLC will be updated as more tracks are added to the game.
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So the entry will be updated when we have more info.