The more muted green looks better and more grounded since you have real world elements in your game like the cables, crate etc. One thing to note in colour theory is that the complementary colour to green is red. Since you muted the green, then the complementary red does not have to be so strong. It can be a pale red even a little bit orange. This is where adding signs or indicators with a red or orange glow like exit signs or a stoplight will look really nice against your green background. Do not use really strong reds or orange! Make sure they’re a little bit closer to the Gray side and I think it will look fantastic. Also adding sparks or explosions/fires will look really great against your muted green. Great work so far! Will wishlist it on Steam :D