Thanks for giving it a shot. Could you answer these questions?
Was it boring because it was too easy or hard?
Do you like games in this genre? If so, could you tell me their names?
It's hard to explain. ...I think most players, me included, are rather lazy and have high expectations. I think it is also better to state the raw truth than beautify if. I think the first thing that disturbed me is all the reading ...like most of the players, I skipped it. I think it'd be much better if you introduced additional stuff in small doses as the level progress.
As for the gameplay, I found it a bit dull. That the ship can only move left or right is the first constraint, but ok, I can live with that. But at first, I'd expect the ship to fire better and have more diversity in aliens ...they all came down in the same fashion.
As for the second question, it reminds me of the old days, where I enjoyed games like tyriant and raptor. Actually, I also made a shoot them up prototype a while ago:
It's a shmup where everything is randomized: the terrain, the ennemy ships, the weapons you can buy... But after the demo, I dropped it due to a lack of interest, its reception was rather cold and not very promising.