Mega Man tribute from 2014. It's basically Mega Man but there's four playable character options and a Smash Bros clone
It's not too hard, challenging, the characters are fun to play as and there's even a little card game if you choose to play as one of the characters. Surprisingly it's my favorite mini game now
There's a lot of options. 3DS, Wii U, Nintendo Switch, PC, Mac, Fire TV, Amazon devices that support Bluetooth controllers, and there's even PlayStation/Xbox versions.