Cantrip-Eye of Agni

[RustyDemiGod]

Eye of Agni:

Evocation Cantrip
Range: 60ft
Components: Somatic
Duration: Instantaneous

A burning beam of concentrated heat rockets forth from one of the caster’s eyes and strikes an opponent within range. Make a ranged spell attack against the target. On a hit it takes 1d8 fire damage, and has a 50% chance to explode and hit surrounding enemies. If the beam explodes all creatures within 5ft of the target must succeed on a dexterity saving throw or take 1d4 thunder damage.

This cantrip can not be used if the caster is blinded.

At higher levels: The spell’s damage increases by 1d8 when you reach 5th level (2d8), 11th level (3d8), and 17th level (4d8).

[JNAProductions]

Eye of Agni:

Evocation Cantrip
Range: 60ft
Components: Somatic
Duration: Instantaneous

A burning beam of concentrated heat rockets forth from one of the caster’s eyes and strikes an opponent within range. Make a ranged spell attack against the target. On a hit it takes 1d8 fire damage, and has a 50% chance to explode and hit surrounding enemies. If the beam explodes all creatures within 5ft of the target must succeed on a dexterity saving throw or take 1d4 thunder damage.

This cantrip can not be used if the caster is blinded.

At higher levels: The spell’s damage increases by 1d8 when you reach 5th level (2d8), 11th level (3d8), and 17th level (4d8).

I wouldn't have a 50/50 chance of doing the AoE damage.
Maybe just drop it to 1d6 damage base, and make the AoE automatic? Also scale the AoE damage with the main damage.

You can also remove the underlined portion by simply making it target "A creature that the caster can see," since you'd need to not be blinded to see.