Thank you, GlitchyDust! :)
Yes, the environment is rather boring and empty. I think I'll make it even more boring in the next iteration. ;D I'm not a 3D artist and never created a game in 3D before, but I'm interested in playing around with techniques. All but one 3D assets were created in engine, which was ok for this since I didn't want details. I can only recommend trying it, Unity can really be fun, if you like to try this engine, too.