Hello, thanks for this very nice remake!
It seems that it there is a "sprite" issue on latest pico-8 version 0.2.5: in this version the platform&door are not visible.Works perfectly in 0.2.4c still.
This problem it still there in Pico-8 v0.2.6 :-(.It seems that it first occured in v0.2.5d(i.e. it works in v0.2.5c, but NOT in v0.2.5d)