Arrow keys + < ( , ) & > ( . ) to navigate the menu. The rest of the controls are explained in game You can hold a direction to modify which attack you'll use. Each character also has 2 special moves (an aerial one and grounded one). Some attacks can be charged, you'll start flashing if that's the case. You can perform a grounded special in the air by holding down + special move button. Special moves can also be triggered by pressing shield and attack at the same time. BY THE WAY: This is an Alpha version, so it's still got a few small issues. The biggest one being corruptions: if sprites corrupt, just reload the page and try again until it works. Scratch limits project sizes, and if they get too large, it corrupts costumes on occasion. Also, the character selection is a bit borked, but it doesn't effect gameplay at all. One other small note, most bugs from 4.0 are still present, unfortunately. I haven't been able to dedicate a lot of time to bug fixing.
I was bored, OK!