Version 1.0 (First complete level) is going well and will be out very soon! It'll have 2 bonus quests, which means I'm planning to make the main level significantly easier. I've already gotten feedback from friends saying the changes are successful. Now, about the changes you suggested:
- Lengthening the platform time before they appear isa good idea, and I've actually already tested it out a bit before you mentioned it. Because of the overlap in some parts of the level, it gets way too chaotic (read: harder) if it's above 4 beats (1.2 seconds).
- Platforms getting darker with time could be an interesting idea! I'll play with it, and if it makes the release, that means I liked what I saw :D
Overall, solid suggestions! I'm also toying with adding visual aids (arrows, etc) into the level itself to make the experience more straightforward. I'll see how it goes!