Stacker

Blocks move across the screen and you tap to drop them. Anything overhanging the block beneath is trimmed away, so the platform narrows with every imprecise drop until there's nothing to land on.

Drop early rather than late. Most players react when the block is already centred, by which point it's moved past, so aiming slightly ahead of where it looks right is the single biggest improvement.

It has you gathering a stack while moving rather than dropping blocks onto a base, so the height you build is something you carry rather than a tower that gets progressively harder to hit.

Only when you run out of platform. There's no finish line - the score is how many blocks you managed before the base became too narrow to hit at all.

Yes, all of them run free in your browser with nothing to install and no account needed before you start, and a run takes about a minute.