In the meantime though, EoSD, PCB, and if you're interested in PC-98, Mystic Square Lotus Land Story, would probably be the best games for you to practice on for the aforementioned reasons.
Mystic Square is not a good game for newbs tbqh.
I always bomb at Icicle Fall on Normal. I have done it, but I am just not consistent enough to go take it on and risk dying.
You can't let the icicles converge on you in the center. Pick a side and try to dodge through it, and then go back around it to center. Be careful of the odd angles the icicles fall in. The closer you get to Cirno, the faster she fires yellow shots, so etc.
I don't know how bombs charge, or how any of that is determined.
Your spell meter goes up as you destroy enemies, bullets, etc.
At a 10,000 point combo, 30,000 pt.s, and 50,000 pt.s you will automatically launch a boss attack. Or maybe I missed a 0 somewhere in there; you get the idea.
The amount of health you lose when you get hit depends on how much of a "direct hit" you take. I think it's a crackpot system, personally, but take what you can get.
X button (bomb) uses all of your spell gauge to launch an attack. Since it literally takes away all of your power, you want to use this as a last resort.
In the Options menu there should be a way to change your shot type from "slow" to "charge". With Charge you can hold Z for rapid-fire in exchange for always being focused. It won't get you wins against human players, but it's good to learn on.