Space Bar, Up Arrow, and W to jump. Dome shaped objects take you up, and floating pulsing balls have to be jumped on as a double jumper. Circular things lead you to a flying part. Please note that I have given credits three times, noting that this is a remix, not original, thanks!
Thanks to CrystalKeeper7 for the original Geometry dash Meltdown, and griffpatch for the original Geometry dash v1.5. Thanks!