Retro c64 for sure.. analog memories loading from cassette, including the slow wait!!! I'm old school 90's with my start on a Tandy 1000 (and BBS Door games, ASCII text, Murder Motel), so I feel the vibe! I didn't load from cassettes on that Tandy 1000, but I did flip floppy disks a lot. I remember loading BASIC code from cassettes somewhere ( too long ago to remember ). Good classic implementation.
Here's my submission, there's an itch submission link as well, but multi-game interaction only works with my own backend server at this link: http://www.lostwords.org/falling-block-jam-start/index.html