Is the GP520 bright enough for a living room?

It is fine in a darkened room or at night. With daylight or strong lamps it washes out, so a dim room or a light-rejecting screen gets the best from it.

Does it have optical zoom or lens shift?

No. It has digital zoom only, so you position it by distance and angle. Off-center placement relies on keystone correction, which can soften the image.

How big an image can it throw?

From 50 to 180 inches diagonal at a 1.2 throw ratio. A 100-inch picture needs roughly 2.7 meters of distance from the screen.

Is it good for gaming?

It runs at 60Hz, which suits casual and console play. Competitive gamers will notice the lack of a high refresh rate and low-latency modes found on gaming projectors.

Does it need a bulb change?

No. The LED light source is rated for 20,000 hours in normal mode, which covers years of typical use without replacement.

The projector, a remote, a power cable and a quick-start guide. You supply an HDMI or USB-C source and, for streaming, your own stick or the built-in apps.