Wow, thanks a lot for the feedback! It will certainly help us a lot to get better!
I'll try to make the mushrooms feel better, and change the platform positioning on some parts. About the visual cue, we'll think of something. So far the character sprite changes and a sound is played, but I guess some more visual feedback would do no harm. On the input buffering, I'm almost sure I did add it, but I might be wrong hahaha I'll check on it as well, and make it bigger if it is the case.
Once again, thanks a bunch for the feedback, seriously! We really appreciate it!