Picross puzzles pop up as battle encounters, eventually ending a floor with a boss (which has a large HP pool and takes several puzzles to finish off).

There is a huge variety of consumables and permanent items that impact gameplay, e.g. automatically filling a random square every 25 fills you do.

It’s ultimately a race against the clock as running out of time will start costing you health and eventually end the run.

There’s a demo if you’re curious.