3RD Person Shooter?

I planned to make the way home like this. There is a platform on the island which is the beam you have to ride on to be transported back up into the sky. However, in order to activate the beam, the player have to place 3 gemstones on 3 platforms.

In order to get the gemstone, the player would have to fight 3 bosses. As for the weapons chosen, I decided that have guns would be the way to go. Hence, here is a model of a Glock I did.