What really sells Chop Goblins is how much game-y it is. Pretty weird thing to say about something that doesn't try to experiment or present some unique with its gameplay at all. The only thing that could be said is that Chop Goblins features lack of jump button just like in first comers of the FPS-genre like original Wolfenstein and first Doom. In that sense, it's definitely retro besides the graphics.
This limitation for the player resulted in more grounded look towards the design of Chop Goblins. While the arenas themselves can't present a challenge for similar game with the ability to jump, here (it seems) player will have to think twice before moving forward. Carelesness is something that most modern shooters try to aboid by giving more options to escape, but this game goes the other direction and asks to just consider your movement.
Strictly speaking, shooters are always about navigation more than anything else. Even the act of shooting a target can't be done without putting your cursor on it. While movement shooters present an additional challenge with more options to navigate, it can be argued that they're temporarily break the 'shooter' gameplay for one moment and become only about 'movement'. Getting rid of options to move helps focus on combat more closely.
Obviously I'm not saying that movement shooters are bad in any way, I just wanted to point that out.

I care for this little silly game too much to admit. It's short and won't waste any of your time.

DUSK is very simple. Probably, that's one of the strongest sides of this game, considering there's nothing to stop you from just jumping in and starting a massacre. The gamefeel is one of those things you can't relay in a review, especially in the text form, but I think it's safe to say that most people (myself included) find the controls satisfying.

Another thing that draws in is the setting and directional choises. The game doesn't contain any cutscenes, it never asks you to take your fingers off keys. Everything that is shown you have to see for yourself. While the game looks downright ugly, it really captivates your attention with the ideas of levels themselves. Something that is very much enhanced by soundtrack. Sometimes DUSK feels like a game a kid with lots of imagination would make if they were given a sizable budget. And I don't mean it in a bad way, on a contrary, it feels like someone's dream come true.

However it does show that simplicity also one of the main downsides of DUSK. The game is so simple, you could call it primitive. Player has very standard set of guns and even more standard set of enemies that not vary throughout the whole game. Excluding only a couple of examples, most enemies are just the same basic concept put in different skins. They walk and shoot. Sometimes they shoot homing projectiles. Sometimes they shoot grenades. Maybe sometimes they fly. But they never show some complex behaviour. It becomes painfully obvious when you meet first few bosses - they're just the same enemy but with a huge healthbar on top. And if you might think that this would change later in game, I have sad news for you. Really, nothing changes in the way you play throughout DUSK. You don't learn any skills, none of the enemies really test them or push you to your limits. Because every enemy acts the same, you can't expect change in player's behaviour. To really understand why it's true just jump into endless mode for a couple of days, and see how long it takes before you stop having fun. DUSK is so simple, the gameplay feels solid and familiar. Something you already accustomed to and want more of. But if it weren't for presentational choices in the campain, this game easily might've been forgotten because of how shallow game design is.

While I enjoyed my time playing, I just can't be sure that it were enemies or arenas since first ones are uninspiring and second ones mostly serve to set the scene. That's why it should be said that most of the design choices left to be perfected. DUSK is more of a good David Szymansky game than it is a good shooter. Overall, it's okay.