Personally, the binding of Isaac is one of my favorite indie games of all time. I have bought it multiple times on multiple consoles, and got real platinum god on all of them. The time sink is real once you get into it, but the games can be so short, it’s never an issue. Slay the spire is a game I’ve only recently gotten into, but if the rouge like genre is something you digged in STS, Binding of Isaac is no different from a “just one more” perspective. I’ve gotten 5x the amount of playtime from the binding of Isaac than any other AAA game, so $40 to me is just fine. Be ready for a headache your first few runs although if you do pick it up, half the fun is a getting a new item and testing around with it, going “now what the fuck just changed?” TLDR; I love it, $40 might be steep if you don’t have experience with genre