head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Execution · Pure Mechanics
An explosively destructible run-and-gun starring parody action-movie heroes.

Execution · Pure Mechanics
An endless arcade runner testing reflexes against scrolling hazards.
Broforce leans Execution (Pure Mechanics); Nyan Cat: Lost In Space leans Execution (Pure Mechanics).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Broforce
Run-and-gun reflexes amid constant explosions
Nyan Cat: Lost In Space
Precise dodging and platform timing decides survival
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Broforce
Enemies are dumb scripts
Nyan Cat: Lost In Space
No opponent to predict; scripted hazards
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Broforce
Random bro assignments and destructible chaos shake runs
Nyan Cat: Lost In Space
Procedural obstacle layouts add some unpredictability
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Broforce
Knowing each bro's kit and level layouts helps
Nyan Cat: Lost In Space
Upgrade choices and route knowledge improve runs
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.