Help me with this spell please!

I’m fairly new to DnD, and I can’t really decide, whether this spell I thought of was balanced at all. To be honest, I do think the level is off, though making it so the enemy is always affected by a condition is way too strong… or? 
I’d really appreciate some feedback!

Melchior’s Mesmerizing Mirror:

7th Level Enchantment spell, costing 1 Action

Range: 60 feet           Components: v, s, m*

Duration: Concentration 

You conjure forth a medium sized mirror in an ornate framing. In a 30 feet cone, originating from the one reflective side of the mirror, you draw every creature’s attention to this mirror, except for those with the blinded condition and those, who cannot see. Any such creature that enters the cone while the spell is active, is affected as well. 

The affected creatures have to make a wisdom saving throw. On a failed save, they are horrified by their own reflection, thus earning the frightened condition.On a successful save, they are mesmerized by their own reflection in the mirror, thus being stunned (though instead of the incapacitated condition, their speed drops to 0).

To break free from their condition, the creatures are able to make a wisdom saving throw as a bonus action on their turn, averting their gaze from the mirror. 

*- (a shard of mirror glass)

Stunned is usually considered worse than frightened, so i'd switch the conditions around.