Why do you have light grey text on white background? I couldn't read anything written on the keys created there. Luckily when the game started it showed a gamepad for like a second so I used my gamepad to move around (was easy finding all the controls)

Still, might wanna change the colour scheme on the site there.

Other than that, it looks pretty impressive (there was strange shimmering all over the place though, textures popping up and down here and there). I went into every room, nice detail. This is created using the Pro version of Unity, right?

It was done using pro, but there are not much pro features implemented there... and it was done 3 years ago Nowadays we take much more care on loaders and on vram usage.

In short I think you should not judge a tool by the works of one or the another person, but maybe how your own work looks in one or another tool. For us its unity, but I guess more than one is really confortable with gamestudio. Good thing all of those have rather generous trials and no $ xxx.xxx price tags (y)