Should I get mouthwashing despite having watched playthroughs?

I‘ve watched a lot of playthroughs because I like seeing other people’s reactions to the game and I’ve been in the fandom for a little while, but I’ve never actually played it because I didn’t think my laptop could run it. I played How Fish Are Made and it’s extension, and the original was a little stuttery but didn’t crash and the extension was smooth, so I’m thinking maybe I can run Mouthwashing on my laptop.

Because I’ve seen so many playthroughs, is buying a 2 hour game for $20 that isn’t very replayable worth it when I already know what happens?