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

Execution · Pure Mechanics
Floaty one-button momentum control in arcade altitude duels.

Execution · Pure Mechanics
A frantic endless runner with retro arcade style.
Balloon Fight leans Execution (Pure Mechanics); Geki Yaba Runner: Anniversary Edition 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.
Balloon Fight
Flap-physics altitude duels demand precise momentum control
Geki Yaba Runner: Anniversary Edition
fast reflex timing for endless running
Balloon Fight leans a little harder on reads, though the gap is small.
Balloon Fight
A couch rival adds light prediction; birds don't adapt
Geki Yaba Runner: Anniversary Edition
no opponent, solo endless runner
Geki Yaba Runner: Anniversary Edition leans a little harder on variance, though the gap is small.
Balloon Fight
Enemy drift and lightning add arcade randomness
Geki Yaba Runner: Anniversary Edition
procedural obstacle generation
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Balloon Fight
Spawn patterns and safe positions are quickly mapped
Geki Yaba Runner: Anniversary Edition
minor route/upgrade optimization
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.