In a lot of games, you cannot fire more than 2 shots at a time. In Crystal Quest, like any old Mario games, you can't fire more than 2 shots at a time. This gets me killed more times than I can count, and its extremely frustrating. Now I don't play many shmups, but I was playing Dragon's Havoc, which is otherwise a great game (or else this wouldn't bother me about this particular game), but only being able to fire one shot at a time, and have to wait for it to slowly move across the screen, and until it's off screen, you can't fire another shot, and I get killed. And Dragon's Havoc is already a super tough game as it is.
If this is a deliberate design choice, I'm not a fan of it AT ALL.