So My Friend Raibys and a couple of other people have released a 2D Action Platformer Game on Steam a few months ago known as, Copy Kitty.
Copy Kitty's Plot consists of the main protagonist, Boki, who was sent a Virtual Reality Combat Program by her Uncle Savant to practice becoming a superhero she has always dreamed of becoming.
The game itself is a pretty awesome platformer with fast-paced gameplay style and a neat copy mechanic of being able to copy your enemie's powers and being able to combine three powers at once for some insane combinations, and there's up to 175 possible combinations as well so go wild! I highly recommend this to anyone looking for some 2D Action Platformers on Steam! They have done a great job with this game and I 'd love to see what else they could do with Copy Kitty. ^^
The Game also has a demo available for those who want to give it a shot!