I see, I should try that, doing the not shooting reminds me of Ikaruga and the achievements you get by clearing the levels by only absorbing bullets
About the enemies staying, maybe I over did it haha, in some way I wanted to create “time bombs” in order to cover my lack of mid boss and make the player kill enemies and not just avoid attacks because I thought that maybe if the player just avoided, they would get bored quickly…
I wanted to do something like Darius Burst, where the enemies go through the whole screen in swarms and you have to eliminate them before it gets too overwhelming, though, in that game you have a better tool to eliminate faster the enemies that stay longer, so I should check better this :)