head to head
vs
Bullet Heaven 2vsMetal Slug 3
Bullet Heaven 2 leans Execution (Pure Mechanics); Metal Slug 3 leans Execution (Pure Mechanics).
Bullet Heaven 2Metal Slug 3
Axis by axis
Execution9 vs 9
Even - both lean on execution about the same.
Reads0 vs 0
Even - both lean on reads about the same.
Variance2 vs 2
Even - both lean on variance about the same.
Optimization5 vs 6
Metal Slug 3 leans harder on optimization: memorizing spawns is the path to a one-credit clear
Two games can score the same on an axis and still test it in very different ways - read each rationale, not just the number.