I'm making this game where bullets are rain drops and if they touch you it's game over.
Now obviously it should be raining more after some time has passed so that the game becomes more difficult.
Is there any possibility to up the fire rate of bullets while the time is passing?
Are you talking about the quantity or speed?
Either way you could make a global variable for the fire rate. Every x seconds alter the fire rate.
Multiple ways to set this up—what is your event for creating the rain drops?
— I'm talking about the quantity.
It's: Every 1 second - Create Object.
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Global Variable "FireRate" initially set to 1
Every "FireRate" seconds - create object
Every 10 seconds - Subtract 0.02 from FireRate (or better yet) Set FireRate to FireRate*0.9