Thanks for playing!
Items not being recognized as placed shouldn't be possible, but this has hardly gone through a full QC suite, so who knows. If I recall, the rapper level requires sufficient system power (ie more amplifiers), so that might have been an issue as well.
I kind of went back and forth on how janky I wanted the physics and controls to be, but in the end it was kind of decided by what was fastest/easiest to do. It seems that it somewhat worked out- there's definitely a spread of opinions in the comments.