Get to the end. All Levels are possible, some are just hard to beat. If you can't beat them then GIT GUD, plus level 4 is very tricky. C to dash forward and D to dash backwards. On level 4 you have to try to phase through the wall.
Go play the second part https://scratch.mit.edu/projects/1297826017 Play the Third Part https://scratch.mit.edu/projects/1304857909