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 · Pure Optimization
A physics puzzle game testing projectile angle and aim to demolish castles.

Optimization · Pure Optimization
A third-person tower defense about funneling orc hordes into gleefully lethal trap corridors.
Crush the Castle leans Optimization (Pure Optimization); Orcs Must Die! leans Optimization (Pure Optimization).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Crush the Castle
Release timing of the trebuchet needs some precision
Orcs Must Die!
Active shooting supplements the traps
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Crush the Castle
Solo physics puzzle, no opponent to predict
Orcs Must Die!
Orc waves follow fixed paths
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Crush the Castle
Deterministic physics, minimal randomness
Orcs Must Die!
Minor wave composition randomness
Orcs Must Die! leans a little harder on optimization, though the gap is small.
Crush the Castle
Finding optimal projectile angles to topple structures is core
Orcs Must Die!
Trap placement and kill-corridor economics are the game
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.