On the topic of free games -
HoloCure - Save the Fans!
It's an unofficial game made by fans of Hololive. I don't know what Hololive is, and I don't 'get' the Japanese weeb stuff at all. It put me off at first, but it's free and the reviews were insane, so gave it a try.
I am addicted to Vampire Survivor, and similar games, and this is easily one of the best (well, most addictive) I've played, potentially even better than the original.
It's crap graphics, a bunch of creepy schoolgirl(?) characters, and probably a load of in-jokes that will never land, but great gameplay, creativity and progression.
One more run...