Cells are dead, but the game isn't
The most important aspect of Dead Cells (currently at least) is that it's still being updated! Both free content updates and DLC are being released regularly, with a Castlevania one scheduled for next year.
Now as for the game itself it's one of the more fast-paced roguelikes filled with a lot of attacking and a lot of dodging. The weapon loot system makes it so you can make choices on the fly about which build you want to go for. Later levels can become brutal because you don't have hearts like in Isaac, but rather a health bar and some enemies can basically one hit kill you. Haven't gotten around to mastering it yet but I really enjoyed what I played so far.