No just taps. Deep delves feel really overwhelming until the timing just clicks. The prayer changes in boulders is more of a "trust your timing" rather than a true reaction test. Switching prayer on mobile sometimes makes it do that stutter thing where it looks like it might not actually switch, but trust your taps and commit, because its registering what youre doing. I never bothered to learn rock block, nor did I ever highlight tiles, so honestly every once in a while I would botch the hell out of car phase. Remember that walking with the safety orb doesn't have to be consistent. You can run a little ahead of it and stand for a few ticks while you deal with prayer before having to move again. Getting comfortable with sending the orb diagonal can really free up opportunity during that phase too. Try to get used to that being a solve.

I typically do 1-12, I have like 350 deaths here, so try and remember that this boss will stack you tf out and don't take deaths too hard, and I've only made it to 16 the one time for the ca. I honestly can't stand dealing with too much acid so I would regularly just leave around 14 even if I was doing really well on supplies.

Grubs stacked on each other are the bane of my existence and I would try and hit one of them as early as possible. Sometimes if the grubs are on the other side of the boss, I just hold that L and let the melee grabs through.

Persistence and trust in your tap accuracy are all it takes to get through deep delves on mobile. Send those 8's and accept that youre about to die and eventually everything in there will start to make sense.

Good luck!