Answer 1

Great stuff, awesome secrets. Only the spikes were a little tricky to see, rest was awesome.

Answer 2

Liked the flow of the level, but damn is it hard to see dust and spikes. Would have been nice if those were different colors or something.

Answer 3

Yep, the opacity thing was a pretty big sacrifice - the color of dust, spikes, and blocks in the collision layer are all the same color/opacity trigger. I'll try putting a rotated emitter of some sort on layer 20 next time and hopefully it will make the spikes a bit more obvious.