Free to play on Steam, really no need to buy premium since you are NOT at a disadvantage against players who do - you use a block-build system similar to Minecraft to build a robot after your own liking, test it, and fight 7 minute battles against other players in team sizes between 10-12 players per team!
What's not to love? You can be a tank, you have access to wings and hovers to build planes and hovercrafts, 3 different types of weapons (SMG, Plasma Bomber, and Sniper Railgun), with a 4th being having been introduced only 2 weeks ago - the Heal-guns that heal your allies and damage your enemies!
EDIT: now 5 types of movement and weaponry to choose from!
It's a great online arena-battle game for free, and I want to spread the love to support the creators and ensure this game keeps getting developed with new additions!
If you're curious, check out some images below to see some crazy designs people come up with (which still work and can wreck people!)
The flying house
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The Magic School Bus (I've lost to this guy many times, he's a beast):
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A little regatta:
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Example of a functioning plane:
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And of course, some Pokemon designs!
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Samus from Metroid
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I could probably go on, but I hope that some of you will decide to give this game a try, maybe add me as a friend on Steam (Juvar) and then we can play together (platoons up to 3 people without premium)
RP gain (the currency), btw, is calculated via lots of factors - number of kills, obviously, but also assists (damaging an enemy enough even when killed by somebody else) to prevent kill-steals, scouting for enemies, and protecting allies. As a medic, you will gain in-game currency for healing your allies in addition to the standard hitting-enemies RP calculations.
It's constantly evolving and a lot of fun to play :)