I have two ideas to make the giant glasses a good power-up!
1. Giant glasses get thrown onto the enemy and then it weights them down to the ground (Sunglasses are really heavy).
2. When giant glasses get equipped, it is put on the player and makes them slightly faster and stronger.
If you are still deciding whether or not giant glasses are a good power-up you could consider these changes to them to make it a better power-up!
I love this game.