It probably won't take until christmas, but definitely finish Oneshot first, it's great. And a little trippy. Seriously, the end is weird.
I haven't played any of those games, but I'll give you my read on them:
Cuphead doesn't seem very similar to Cave Story to me, lacking in any kind of deeper story. You'll probably spend more time fighting bosses than running across stages. It's also a hard game, not really for people who won't bash their head against a boss a few dozen times.
Tokyo 42 looks really cool to me, with it's perspective and such. It has a local multiplayer mode, which looks cool as well.
I don't know much of anything about Shadowrun Hong Kong.
There's probably not much point in considering Cyberpunk 2077 until it's, you know, out. I don't think there's even any gameplay videos for it, so for now it's an intriguing non-game.
I honestly don't know enough about what kinds of games you like to give a real recommendation, especially from a lineup of games I haven't personally played (but they're all on my 100+ game long wishlist! ;P), so instead I'll just blurt out a game I like: Heat Signature!
Here's the steam review I wrote, because I can't be assed to write a plug for this game multiple times!
So much teleporting and whacking and speeding and shooting and hacking and smashing and exploding and defenestrating. Very recommended, 'specially if you like going fast and hitting people with wrenches/swords/knives/bullets/grenades/vacuum.
Also remember that subverters can unlock doors! Very useful!
I'll vote for Tokyo 42 on the strawpoll, for the flimsy reason that I think it's the one I'd like the most.
Oh, one more thing is that Tokyo 42 is a "daylight cyberpunk" setting as opposed to shadowrun where it's obviously all dark and shadowy. This means that Tokyo 42 has pretty colors and stuff to go along with your bullets and blood, which I sometimes prefer. None of that really matters, but it's another way of looking at things!