This is the best fan-game out there, no doubt about it. The Keen sprite was done in nice 256 colors, and doesn't clash with anything. And you will be humming the music a long time too. The sounds are the original Keen sounds, but more realistic.
Of course, nothing's perfect. Keen moves a little bit to fast in my opinion, there isn't a story yet, and this game shouldn't have been abandoned either. In the full, you were gonna have 9 weapons too choose from.
Overall, it's a good game and it shouldn't have been abandoned.