There's a bit of a barrier to entry in this one, I had to die a couple of times before I could wrap my head around the concept. But once it clicked, I got a very strong case of "just one more run".
A lot of the little elements on this just work really well with the concept. The wrapping levels with the symmetrical layout, the ghosting/movement lines to show your trajectory, the wave-based structure. I just wished your shots would recharge on a timer or when defeating enemies, now I'm sometimes stuck chasing a lone skeleton around who just consistently stays out of reach.
Being able to stab down when landing on an enemy would've been nice as well.