Using assets is not wrong at all. The game itself is original. Especially when learning, it's important to focus on the map making, story, gameplay, and not waste time with modeling and shading thingds that you can get free to use. No talent in game developing? The game design is his own, so you played yourself.
Never said that there's anything wrong using assets (It's just a dick move not to mention that they used them if you aske me!) and I've seen this kind of game design that you say to be his own in many other games so there's nothing original in this like whatsoever...
I close my case so don't bother to reply to me since I won't be reading it