It's an alternate way to play for people who prefer to play that way (no ads, locally, offline) or who want to support the game and its years of free updates, or myself in general. Kongregate shares advertising revenue with developers, so while the game is free to play, I'm getting paid at the end of the day, letting me make more awesome stuff. (And on that note, if you like the game and want to support it, whitelist it in your adblocker if you run any.)
It's an alternate way to play for people who prefer to play that way (no ads, locally, offline) or who want to support the game and its years of free updates, or myself in general. Kongregate shares advertising revenue with developers, so while the game is free to play, I'm getting paid at the end of the day, letting me make more awesome stuff. (And on that note, if you like the game and want to support it, whitelist it in your adblocker if you run any.)