Warframe is indeed a lot of fun. I think there was a dedicated thread for it a while back, too. Highly recommended to give it a try if videos of the game action look appealing to you (since, you know, completely free unless you want to spend money on stuff).
I've also been playing Superhot: MCD, and...eh? There are some fun new innovations, but the key change to the gameplay loop is a bad one, I think; focusing on short bursts of careful perfection like in Hotline Miami or Super Meat Boy felt like a much more involving, flow-generating experience than having to shepard my lives.
Also, the game itself telling me that there's no point did make me decide to, at least for now, shrug and shelve it.