Theres a few things in it that dont quite match up.
You cannot slide through doors, you lose your charge if you pause, there's no password or save system, E-Tanks don't respawn after continues, large energy pellets only restore 8 health as opposed to 10, and yeah, for a game that supposedly got official support, it doesn't really show, especially the stage designs and just their look. They look so damn plain and boring.