On my end would say its a mix of sebastian says that the enemies spawn quick (especially at launch, a couple seconds of wait could have been beneficial, and the input mapping felt a bit weird, like juggling with the number and the other keys i mistyped a lot of times which with the enemies gives you few margin of manoeuver, feel like you have to put your right hand on the numbers to make it more consistent which felt weird.
Still gj on submitting !