head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is optimization, and it is a single point.

Optimization · Practiced Mastery
An isometric action RPG narrated as you play.

Optimization · Practiced Mastery
Memorising and rapidly inputting spell recipes while dodging your own friends.
Bastion leans Optimization (Practiced Mastery); Magicka 2 leans Optimization (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Bastion
Action combat needs timing and aim.
Magicka 2
Typing element combos quickly mid-fight is the skill ceiling
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Bastion
Enemies are scripted.
Magicka 2
Enemies are scripted; friendly-fire chaos is not prediction
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Bastion
Minor loot variance.
Magicka 2
Co-op misfires add slapstick randomness, little else
Magicka 2 leans a little harder on optimization, though the gap is small.
Bastion
Weapon and idol builds reward planning.
Magicka 2
Knowing the strongest spell recipes trivialises encounters
A matching score does not mean a matching test. Two games can both sit at 10 on execution and demand completely different things of you - which is why the reasoning above matters more than the number beside it.