Yes, the ICJ can order a ceasefire. It ordered Russia to stop its invasion of Ukraine, for example. In this case it decided not to, but it did order other measures (which hopefully will save lives, but time will tell).
Unfortunately for the Palestinians, that is not what was ruled. They were hoping for a full ceasefire like what you have interpreted, but they are very disappointed in the ruling because it does not say that.
What it does say is
1. Israel must do more to prevent the possibility of genocide. Genocide is killing a people with the intent of killing them for the sake of destroying them, and not as collateral damage, so it does not mean stopping all death. Collateral damage, unfortunately, remains on the table.
2. Israel must report back in a month with how they are doing that. For example, they could show lower amounts of collateral damage, an increase in aid, punishments for officials that make statements that could be construed as genocidal, and so forth.
That is better than nothing, to be certain, but it is far from a ceasefire, unfortunately.
It is true that there were a few incidents, but they only account for a very small fraction of the death toll.