Eh, true.
Gritty Columns
In the first act, the quicksand is rising too fast for me. I feel like you set it to a speed which would only challenge you, the level designer.
Fume Shaft
Um, this is awkward. Fume Shaft 1 is the worst level in the pack so far.
The rails in the beginning are awkward, being almost a hallway. But there are so many other hallways in this level that you should just get rid of all the other ones. The transition caves, for example, I dislike. Also, the pipes which run under the slime are hallways in disguise. There's a certain novelty to them which makes them less hallway-like, but they're still hallways.
Also, I am opposed to jumping on really really small platforms over deathpit.
I can't finish either act without gameovering, so I'm moving on.
Liftoff Gantry
Why did you hide lazers in the darkness?