Before we collab, I think it's best for me to tell you my skills: I am still learning c# programming on Youtube and is practicing on and off, I can design (Straight lines and programmer art), and I study player psychology in games (What and how a player will interact with the interface and how they will use M to go through the game). Not an artist. I have a quite bit of ideas: We can try joining a game jam and follow it's theme.
My other skills are music composition and writing. I don't have a MIDI right now but I can find ways to make tracks for free ;)