That was... not what I expected (though what can I expect when the modifier is genre fakeout?)
There's a few issues with the game. I actually didn't get to the twist the first time through, because I got wrecked by the guy with the rocks just before it was supposed to happen. The movement is glacially slow and horribly unresponsive, and the attack is super unsatisfying. I have a lot of nitpicky complaints about the game after the genre shift- it's honestly a pretty disappointing implementation of what it's supposed to be on so many levels. There's no endgame screen, it just kicks you to the main menu, and the game doesn't fit in the window it's supposed to play in.
To be honest, though, I think the biggest problem is just that the game overstays its welcome. There's no dealbreakers here, but I wish it was just a little bit easier, paced just a little bit faster, and had a definitive ending (or, if it does have one, had one that came quicker). It leans really, really hard on that shift as a punchline, and I feel it would have been best to laser-focus on that instead of trying to also have some length to the game.