This honestly is the best outcome. The textures still look pretty great for a 13yo game. It has microtransactions, but the unlocks were designed in an era long before that stuff so you definitely do not need to pay a single cent.
It's an arena action game where your skills come from a deck of abilities you build ahead of time. There are almost 400 skills IIRC. You got projectiles (bombs, lasers, cannons, etc.) shields (frontal, 360 degrees, parries, etc.), movement skills (flying, dashing, warping, etc.), melee (swords, punches, etc.) and tons of other uncategorized abilities (swap your opponent's directional inputs, steal their skills from their spawn point, rain meteors on them, etc.)
You have 5 "colors" like in Magic the Gathering with mana as well. You balance the weaker, cheaper, more narrow skills against the more expensive, big skills. Made up example: a 1 mana shield might be a limited use frontal shield, the 3 mana version is infinite use, the 5 mana version is 360 around you. Tons of variation and customization. Maps, which are destructable, also have different styes from a cramped indoor space that promotes close combat to a long stretch of highway that is better suited from long range sniping.
It won't work on 8 (unless UWP somehow works and they figure out a way to drop the Windows 10 requirement like Halo Vista->XP), but you can "buy" it off the store to show support until you get Windows 10 and/or a X-box 720.