Is this series eligible for the reclaim your game perk? I bought it on Slitherine and I can redeem Steam keys but Id rather have it on GOG.

Short answer is no Slitherine has a logistical clusterfuck when it comes to their games. None are compatible with each other for example they sell on Steam, here and on their website. Each seller excludes the other. Such a strange way to sell a product. I think you can redeem the Steam keys if you buy on Slitherine, but they do not do something similar for GoG. I bought a few of the micro games on Slitherine and I regret it. Upon applying the patch it forces the game to run on Steam, lame. Buy it here is my suggestion even though the "demo" cost 20 dollar here, wait for a sale then buy the base game.