I'm a hobbyist pixel artist and serial tinkerer with game engines based in the UK, with a background in traditional art, looking to help out. I saw the recent Indie Game Clinic video about the month long collab jam and thought it would be fun to get a bit of experience working in a team.
I've spent my spare time pixeling for years now. Here's my PixelJoint gallery https://pixeljoint.com/p/221123.htm I use Aseprite and occasionally Gimp. I have some experience of pushing art into engines. I've dipped into Gamemaker, Twine, Godot and various other engines (old school UnrealEd 2, NeverwinterNights, Doom, Quake 3 and other retro games) over a number of years. A few of my things are even finished! https://evens.itch.io/
I haven't got any professional experience in games, but I do have time over the course of April and can put in a few hours a day. That should be enough to polish off any number of pixel art assets and help relieve the burden of asset creation on a programmer/designer.