Interesting game concept.
The lights are what you can expect from the powerhouse that UE is, but I'm missing more things in the scenery to make me feel like in a real factory.
When the level design works, it's quite joyful to play, but when it doesn't, it becomes frustrating. The ball keeps too much momentum to handle at some points, making the platforming a bit unprecise at times, you should consider adding a maximum momentum, and enabling the player to lose momentum quicker when moving. There were many instances where I tried to stop the ball, but it keep rolling because the force wasn't strong enough.
While I respect your decission not to add music to the game, there are no sound effects either; you should really add them for basic stuff like the explosions, the air flowing when you jump or fall, a rolling sound effect, it will make the experience much better and enjoyable.
Also, you should lock the mouse to the center of the screen, there were many instances where the cursor left the screen and it was a little annoying, specially since that distracts the player and you have to be very focused in this game. And you should be able to look up and down, specially in this kind of game where some platforms can get out of your sight easily.
I also would make the numbers above the barrels be hidden behind walls, it's a little bit distracting having so many numbers at the same time on the screen.
Other than that, it was a good experience. Keep improving!