Very good NES Homebrew, I haven't seen the original PC game, so I can only speak about this NES game as a standalone experience, and it's great. It's a platformer, but you can't jump, only use a grapple mechanic to jump up walls or grapple the ceiling and so on. The game is very challenging and very fun though occasionally frustrating, the dialogue is humorous, and it also comes with extra content, like race mode, play as a bad guy and even a VVVVVV styled game mode, where you switch gravity to traverse through tough challenges. This is definitely one of the best NES homebrews, very fun, and it's also free to play, so you have nothing to lose by checking it out. I highly recommend it.