head to head
Neither is simply harder - they are hard in different places. DOOM (2016) demands more optimization; Velocibox demands more execution.

Execution · Pure Mechanics
Push-forward arena FPS where movement and aim are the whole game.

Execution · Pure Mechanics
A brutally fast endless runner that is pure twitch reflex execution.
DOOM (2016) leans Execution (Pure Mechanics); Velocibox leans Execution (Pure Mechanics).
Velocibox leans clearly harder on execution.
DOOM (2016)
Aim, movement, glory-kill timing all peak.
Velocibox
Twitch reflexes at extreme speed are the entire game
DOOM (2016) leans a little harder on reads, though the gap is small.
DOOM (2016)
Demons scripted attack patterns.
Velocibox
No opponent to predict in this solo runner
Velocibox leans a little harder on variance, though the gap is small.
DOOM (2016)
Minimal encounter randomness.
Velocibox
Obstacle patterns are fixed and rapidly memorized
DOOM (2016) leans clearly harder on optimization.
DOOM (2016)
Rune and weapon mod picks meaningful.
Velocibox
Memorizing patterns helps but reflex execution dominates
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.