Like the other play testers, I found this way too difficult. HOWEVER, I have to give kudos for the well-tuned controls. This game is very difficult, but it is close to feeling like it's mostly my fault when I fall or miss a jump. That's a good sign! So why is it "too" hard and who decides? Well, you've got three people saying that. "Too hard" can either mean "this kind of game is not for me", "the game is fighting me and I feel like I can't win", or something else. It's very subjective! I think for this group it's a little bit of both. The reason I say that it's close to feeling right is that there's not that much of an indicator to follow, so you're largely going based on muscle memory and practice. Since that's the case, starting the game with a much easier level might be better. For example, just a few platforms. continue ramping up the difficulty as you go. Your current game is like the ultra hard last level.
I think you should also ask yourself what experience you want the player to have. You were focused on speed running, so do you know anyone who speed runs? What do they think of the game?