Are they killing an excessive number of civilians as collateral damage? Certainly seems like it. But collateral damage is not genocide.
If they wanted to genocide the Palestinians, they'd be shipping 'em to camps and gassing them, like the Nazis did. Looking at it another way: let's say that (hypothetically) Hamas stopped using people as humans shields by firing rockets from hospitals and building tunnels under schools. Do you think the number of non-combatants killed by the IDF would go down? Because I do, and to me that says Israel's goal is not in fact killing non-combatant civilians, even if they're killing far too many as is.