It's ~$15 on steam at the moment, and a relatively tiny 300MB download. If you spend even 2-3 hours on it, enjoyed, then it's definitely cheaper than the price of a movie.
Unless a game delivers hundreds of hours of play in both single and multiplayer, is moddable, gets at least an 85 on Metacritic and the devs have signed a contract to ship free updates and content quarterly for 10 years, it's a casual game and you should seriously think twice before spending even 99 cents on it.
Or you should buy it on Steam, play for an hour and 59 minutes, then get a refund and proudly proclaim how it didn't meet your standards, alongside the other four games you refunded in the last couple weeks.
Or pirate it, because you like the game but you don't want to support the industry's high prices.
There are some other suggestions in there as well, though I think I'd start with Factorio first.