I would say that the game has more of a timing/memory rather than a “reaction” gameplay. After all, in the majority of all “unexpected” deaths you happen to stand at the “wrong place” and unless you got a really (and i mean really) short reaction time you’re dead after several milliseconds. You’re almost expected to already be at the “right place” before the event triggers.
It’s mostly a memory type of game, you walk a few seconds…end up dead…analyze what happened and in the next atempt solve the problem…end up dead seconds after…analyze and then back from square one remember all the solutions.
But it does requires skill and timing indeed, to solve a lot of levels one must make some very carefull movements and there’s little room for errors.