Since no one made on I did.
https://flockmod.com/r/bunkasai24

You don't need an account, only 3 layers to work with, no undo button and its easy to erase stuff that others have made which sux.
The other option is magama and requires an account but its pretty easy to just make a proton mail or something and sign up quick, i made one for that too if people wanna be more detailed and have more layers and stuff

https://magma.com/d/jrwvizaeeq