I really like the art, the music and atmosphere, theme, etc.!
I'm less excited about it being another one of those games where you hover the mouse over stuff to 'attack.' There seem to be a million of these, and I've never found one of them especially enjoyable. Maybe that's just me and everyone else loves them? I appreciate that it at least has the bats and minions and all that so I don't have to mouse-hover too much.
But my overall take is that the art deserves a better underlying game design to go with it. Because I'd definitely enjoying looking at it for an extended time if it was some kind of longer play incremental/idle type game with upgrades, or whatever else