when I was running the game on the website, I feel like this game was made in Scratch, because it started with the flag, the green flag.
Viewing post in Incredibox - Sprunki comments
it is. It got taken down on scratch though, and this was an upload in the games state before the original post got taken down. The creator, Nyankobflolol, has reuploaded Sprunki onto Cocrea with new stuff though.