I had never heard of this game before, tried it a little bit, and yeah, you can pretty easily tell this is unfinished, it's buggy as hell, at one point my paddle went missing and didn't come back, and some other time the ball got stuck on a grey tile and the game just refused to progress until I used the "Skip Stage" button...
Still, it's nice that this was released so that we can see what could have been, but with such lacking graphics and not particularly ear-pleasing music, not to mention the fact that it was a block-breaking game in the early 90s, I'd imagine the genre would have been as good as dead at the time, I don't really think it would have been much of a success, but who knows? I could be wrong...
It could be a bit successful though if it sounded kinda like this:
I don't think moving a small ball and a paddle around the screen would require that much CPU time so the game could easily have used some 16KHz samples...