What you see here is a Game Boy “demake” of Super Smash Bros made by Pikigeek. It’s only two characters, but it shows what it might have looked like if it was on Nintendo’s classic console system rather than console. I sure as hell would have played it.
The main differences are that there’s no shielding, and I also don’t believe you can fall through platforms or grab onto the edge. Other than that, it’s pretty much the same system. Check it out above.