It took me a while to figure out the blue person could double jump. Then once I figured that out, it was a bit hard to get them to double jump consistently. I struggled a lot just getting past the first 2 spikes, but once I did, I started to get the hang of it.
I love the way they each have their own sort of "feel" to them. I would maybe suggest slowing the gravity just a little bit on the blue and red person. Because getting past those first two spikes requires some pixel-perfect timing.
Very cool concept, and the visuals are really nice and distinct. The star constellation thing is a really nice little gimmick. It would feel really relaxing with some ambient music and twinkley sounds.
This is a short play-through, but I feel like it accomplishes exactly what it sets out to do. The core concept is there, and I didn't run into any major bugs or anything. My only critique is I would love to see this more fleshed out.