itch.io

what OS do you have? i can play properly even when running the game through Proton on Linux

if you are using OBS, you can set something like

html {
    background-color: rgb(0 0 0 / 1%) !important;
}

for some reason i don’t know, if you put all as 0 it shows black, if real transparency not working, you should try a chroma color, if color picker is not working properly, you should change it also via Custom CSS, as described on the manual:

html {
    background-color: #91a666; /*replace #91a666 with your preferred color*/
}