Hey! I'd love to help with 2d sprites and music. WA is my god damn life, and you have the right attitude to be a developer on a spiritual successor! Go you!
I made a worms map, and it should show some of my skills in design. Remember the color limit I had to work with, though. I have been a musician for many years.
PS: I'm a guy who loves options, but I feel like the swappable movement systems might be a bit too much. It's probably better to just rip off the WA movement system, as it is perfect.