It's an interesting idea, but on my fairly good device, this game lags when there are a lot of projectiles on the screen.
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I don't know what kind of powerful machine you have there, but I didn't encounter any issues when testing on a laptop without a dedicated graphics card and running an older 7th-gen i3 processor. But you're absolutely right—if we're going to develop the game properly, I'll definitely adjust the bullet mechanics for optimization.