Long ago in what seems like a completely different world I added in the ability to load your own levels and never actually put instructions on how to do it anywhere. I’ve made a sticky forum post for it, but I thought I’d also share it here:

The filenames for the custom levels are “byo_level_fg.png” “byo_level_bg.png” make them the same size as one another and place them in the RebopBlasters_Data directory (should be in the same place as the executable).

The two images need to be the same dimensions, but can be quite large. “byo_level_fg.png” will be loaded such that anything with above zero opacity will be solid, destructible terrain. “byo_level_bg.png” will be placed behind and is a great place to put dumb memes.