General questions for a newbie about arch viz walk thru using UPBGEG .3

Hello. UPBGE .3 is my first real stab at game engines. I have created an arch-viz “walk-thru” of a client’s large interior space. Plenty of 3D furniture (the focus) and I’m using the colorized plan view of the space as the floor plane. No 3D walls, etc. currently. It kind of looks like a chess board with pieces.

I have a few general questions:

  1. The stand alone “game” is 3.16 GB. Should I somehow make this smaller in size? If so, what is the best way of going about that?

  2. The idea is this “game” would go out to various people with who knows what hardware/software and more than likely questionable technical understanding. Is there a way to make this game run in a browser for simplification?

Other than that I’m pretty happy with the preliminary results. I can work on quality as I learn more.