This was simply great in my opinion. Lots of nostalgia, great music and oddly I feel it's slightly easier (if anything) compared to the actual game. There is actually much more to the Castlevania DLC than I show here, because I wasn't able to access the second part as you need to do a few runs to unlock the various ways through it seems. Also really early on into Dead Cells, so I don't have all the fancy stuff required to go and get many of the secrets and similar, which I still need to play through some alternative routes to unlock in the main game.
Overall this DLC is awesome and hit all the right nostalgia buttons for me, while still playing like Dead Cells.
At present, Turtlesism has 34 views spread across 1 video for Dead Cells, and less than an hour worth of Dead Cells videos were uploaded to his channel. This is 1.02% of the total watchable video on Turtlesism's YouTube channel.