Hi, thanks for the feedback!
Is the R button not working at all for you? That's interesting to me. This hasn't been an issue for anyone else I know. I'll look into it for sure! Is there any more info you can give me or does the R button just do nothing pure and simple?
As for the blue blocks, yes sometimes the height is too low to break them with a charged jump, but this is intentional. All the levels are still possible to solve! I wasn't going to make it easy for you was I. ;)
Keep going, I know you can figure it out!