but I couldn't get the control of Severance so I dropped pretty quickly
If you mean the combos, it's pretty easy once you figure it out.
For example:
The sword means the atack button, the arrows are obiously the AWSD keys, and the arrow with that "divided" tail in left/rigth dogde attack means your dodge button. Lastly the + icon means a pause, or rather for you wait until the previous action animation is nearly finished, before the next input.
So for the rigth dodge attack you click the dogde button and the D key at the same time, and a very short while after that input (while the rigth dodge animation wasn't yet ended) you click the attack button.
Unless if by controls you meant something else, maybe the fact it operates on tank controls?