Shovel Knight V Dark Souls

Friday you played Shovel Knight and Dark Souls, both are contemporary games playing with the trope of knight and shining army.  Explain which was more fun to play and why. Consider Csikszentmihalyi Flow chart where would each game go on the chart.  Can a platformer game be as fun and emersive as an  open world 3d action role playing game? How? Why?