I like the new endgame/final 'boss'! I beat it in this version and the last one, and the sudden endgame for chickening out in the previous iteration was a little jarring. This one feels frantic, but uses what the player has learnt about the game up to that point, so it makes winning feel earned (even knowing it's so RNG dependent).
You may want to look at resetting the bid rate down to its baseline after moving (ascending, winning or losing) - because the gambling increments scale with the player's financial position, it's easy to end up in a spot where you have a hundred dollars, are gambling up to a million dollars (because that's the kind of money you were playing with back when you were rich), and have to click -100 about ten thousand times if you don't want every stonk session to be 100% ride or die.
I've noticed two Nash conditions you may not have planned for - I'm not sure they're worth addressing, since the player (ie myself) still had fun despite IDing an Ur-Tactic... but they may violate your authorial intent, so I wanted to let you know. (Anyone else reading this, SPOILER WARNING!)
1 - Going 100% in and riding a stock until it rugs gets immediate prestige currency. I like that the game has fail forward mechanics, but the current balance rewards intentionally tanking for three or four minutes to snatch up the nonAI Bot bonuses.
2 - Because insurance is a set price per ascension layer, it's easy to go all in and chicken out immediately at x1.3 or so safely, over and over. Very quickly you end up with funds so high that the insurance is a non-expense, a rounding error. Since that's exponential growth, it doesn't take long to build a maximalized AI Bot empire while in Moms Basement. You can instantly max your unlocks from that point on, skipping straight to All In ascension tests for the rest of the ascension layers, because of all the cash flow the bots give you.