Ramp 2024 Doom. Include a 512×384 image lump rampshot to display it as the thumbnail image for your map in the hub level. Ramp is a project built by everyone who chooses to contribute!
Iirc, the intro video for ramp 2024 said maps could be submitted under boom: If you’re interested in playing them, just go the the ramp website, download the latest snapshot and load it into gzdoom.