If you follow any JP vtubers you probably already know about the watermelon game that is a smash hit. Here is an indie stream of it.
Also Niji got infected by this infectious game
Ohayama is an OG streaming monster
Anyways, there are clones of this game free to play. Here is an SSRB one
hololive fanart puzzle game
yeqwep.itch.io
You will see Holos play the actual game soon
Miko and Astel have already started