Your constitution score increases by 2 and dexterity by 1.

Half-oozes mature at a slightly faster rate than humans do and reach adulthood around the age of 15. They live slightly shorter than humans, rarely often exceeding 70 years.

You have resistance to acid damage.

Your ooze ancestry has gifted you with the ability to produce toxic substances. This allows you to cast the spells Acid splash as a cantrip using constitution as your spell casting modifier.

For purposes of tracking and spells, you count as both ooze and humanoid.

Thanks to your ooze blood, you have superior vision in dark and dim Conditions. You can see in dim light within 60 feet of you as if it were bright light, and in Darkness as if it were dim light. You can’t discern color in Darkness, only shades of green.

As part of your movement you can move through a space as narrow as 1 inch wide without squeezing - any equipment that can't squeeze through is left behind.
As part of your ooze heritage, creatures who attempt to grapple you do so at a disadvantage.