Weapons of your ship varies with your playing style. For example, you move forward aggressively in the game, you'll get a short range and highly powerful blade. Or you bump into an bullet many times, you'll acquire the ability to slow down the bullet speed.
Blade : It has a short range, but highly powerful.
Overclock : Slow down an enemie's bullets.
The divergence of evolution only happen in Original Mode. In History menu, you can confirm the pattern of the evolution you've ever seen. (Press L-Shift key to translate the guide into English.)
History menu
If you press the Z key at the opened icon, you can play in Free Mode with weapon types you choosen.