How do I make enemies spawn more frequent and move faster ?

The game I'm creating is in the style of a vertical space shooter but the player cannot shoot and gains points by surviving the longest amount of time. How can make the enemies spawn more frequently and move faster the longer the player survives ?

the question is:

how do you spawn them at the moment?

Let's assume (as you have not shared a capx, so it is just guessing) you currently have a spawn at every 5 seconds.

Take that spawn out of that condition and change it to 1 second. Set up a variable that is deducted by 1 every second, when that variable hits "0", trigger an event to spawn an enemy + reset your variable back to the number of seconds you want to wait again.

Same you can do with the speed. I don't know how you handle it at the moment, but you can change the property every x seconds to increase the speed.