The sound upon starting the game is very grating, and pressing any key upon dying is not functional. The jump is very floaty, though I see what you were trying to do with going higher by pressing the button longer.
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Thank you for the feedback. The "press any key" bug is new. I'll try to fix that. You're right that the jump floats too much. This is the first time I've tried to make a metroivania and I'm blown away by who difficult it is to get a good feeling player controller. I want to improve the feel of the jump so it is more responsive and the gravity is stronger.
What works for me is setting two gravity values, one maximum and one current. The maximum is how strong gravity is at all times, and the maximum speed you fall with. Current gravity increases from 0 to max the more you fall, at your specified rate, but also when you jump you set the current gravity to a negative value so that you fall upward for a bit, the specified rate keeps adding to it until it reaches 0, and then keeps increasing and you start falling again.
Hope this made sense and that it helps