Needs a LOT of work!!
I'm generally forgiving when games don't come across as "my cup of tea". However, I suspect the other 5 dwarves left the job rather than being associated with this effort that falls way too short.
Although they do mention that a gamepad/joystick isn't implemented, it's one glaring omission from the old 8-bit games that this game presumes to pay homage to. Too often you get killed because the keys don't work as responsely as they should. For some reason, the 1st level bad guys are just a square masking out the shape of a crocodile?/lizard?/who knows since you can't distinguish them. The instructions seem easy to understand, until you start the game.
Usually, I'd suggest some more work on the game but it seems that the programmer doesn't have the knowledge/desire to complete this unfinished program. Overall, a total embaressment for all involved who put out even this demo. Come to think of it, I still recall typing in by hand and saving on cassette tape (on my old Atari 400/800) games that looked worse but I can't recall any with this bad of playability.Better luck next time!
Doc Randy