http://store.steampowered.com/app/383980/
Rivals of Aether is a fast paced platform fighting game which was heavily inspired by Smash Bros.
I've played it for a few hours now and being a huge fan of the Smash games I think its fantastic. It's currently in early access and has 6 playable characters which will grow to 8 for launch. The current game modes in the game are 1v1 online, up to 4 player local and practice mode but they will be adding a story mode eventually.
It currently only costs £10.99 on Steam which I think is a bargain.