Thank you for your comment! We'll add user interface including HP bar and possibility of rebinding keys as soon as it will be possible. As for troubles with jumping, the mechanic of some time given to jump even after leaving the platform is called coyote time and should implicitly help player to jump and not fail, however due to some mistakes in design of the first room this mechanic was the only stable way to reach the platform. It will be corrected in the next patch and we hope we won't make such mistakes ever again ;) As for the first and third points, I did not really understand what you mean, can you please clarify what you were trying to say? Hope to hear from you soon)