Very good game indeed! Your visuals and music are awesome. There is a lot more good things to say but I am not good at this (sorry). I can however say what issues I found.
Here are them:
-in the third level, if you walk on the moving platform, and it goes up, you will go into the wall.
-I was aiming a button with a ball (level 3, on the platform that moves vertically), but I died without knowing what hit me. I just couldn't pay attention to the bottom and the top of the screen at the same time. After doing the same thing, I realised it was the hammer that hit the robot. I don't say it is an important issue, but it can lead to frustration. Maybe some death vfx or sfx would help?