Some things to say are that you should make it clearer that you have to actually hold space instead of just pressing it (it might sound silly but it's not always obvious) and, as someone else pointed out, it's not really challenging, I can just repeat the simple pattern "rewind - go to far right - repeat". But since it's your first game, you've done a good job, I notice there's some effort, and it also looks visually good, so well done