Thank you very much for this feedback, I'm glad you enjoyed the game !
I understand what you mean about the music, and the speedrun timer does add a bit of pressure...
As for the outline of the blocks, I'm afraid it might make the game too easy, but having an action to trigger a flash and briefly reveal the platforms for 0.1 seconds could be a good idea. I'll consider it for the official release ( since I plan to keep developing this game ).