Cooldown between missiles is intentionally long, otherwise you'd just spam them all the time to kill cubes too easily. Can you elaborate on it getting slow? If it's something I can easily fix I will do, but I don't notice any problems.
I was not a cooldown problem missile get destroyed in midair. I never see it fly through middle of the screen.
In bonus area controls a very responsible and in main game it feels like you have a window of opportunity to a select where to jump and you cant change it mid air. And then you need to jump 5 time on one place again,