Internet Archive (also known as Archive.org) is a public digital library that provides free access to various media, including but not limited to music, videos, programs, games, books.
Internet Archive allows to upload and download files freely and without restrictions (as long as they don’t violate copyright).
Bombs vs. Sleepwalkers assets hosted on Internet Archive
Public assets of Bombs vs. Sleepwalkers franchise can be found here: https://archive.org/details/bvsgame
Assets are free to use, they’re released under Creative Commons license (normally CC BY 4.0).