The art is great. It's a neat idea, but there is a lot of room for improvement. The elevator itself looks fine, the big glowing wall on the left feels a bit weird to me. Some stepping sounds with reverb, and for the dialog text would have helped. And for the text, you could use either rich text or some other formatting, for a better representation of the tone of speech and stuff by using different fonts, sizes, and things like that.
Also, if you plan on making more games with dialog, it might be worth spending some time making a good dialog system, with variable speed for the text being written, dynamic formatting, and sound effects. Optimally packaged in a plugin, so you can easily reuse it in other projects.
The "Press 'E' to Talk" text not being aligned to the character, but some place on the ground behind them was a bit weird.
And for some reason I got a bluescreen when first starting the game, but I don't think it's the game's issue, I bet windows was doing some weird stuff in the background