Is shrapnel free-to-play?

I'm curious, is the game "Shrapnel" available as a free-to-play option, or does it require a purchase? With the ever-evolving landscape of gaming, it's essential to stay informed about the various monetization models that developers employ. If "Shrapnel" is indeed free-to-play, I'd be interested in knowing if there are any in-game purchases or microtransactions that players can engage in. Alternatively, if it's a paid game, I'd like to understand the pricing structure and whether there are any additional costs or DLCs that players should be aware of.