Can the enemy spawner portal spawn enemies faster (and not only have the portal move faster) at higher difficulty? (In waves like Portal Gun, Spawning Trouble, Interdimensional Portal, etc)
Can the color of thunder storms in an electric environment mission be yellow instead of sky blue (this suggestion is minor, and maybe not worth it, but I am suggesting it because it has stayed in the same color since its first appearance in the ice chapter in ci5, but if you will keep it sky blue, that’s ok)
Just like Skyscrapers wave, would you also reduce the row of chickens in the Stacker wave (and its mirrored variation too)? The space in that wave is too tight there.
Also, why are Balloon Chickens not counted for Multi-kill bonus?