Honest review:
Art and animations were very nice.
Jumping was quite awkward. Not being able to move mid jump was jarring and the collisions were jerky. This can make things too tricky in a platform game, especially a stealth one. It's an unforgiving system and requires quite a bit of trial and error to land on platforms.
I wouldn't recommend binding just a single control to the mouse. You could just bind the attack to the keyboard.
The camera's position is off when respawning. Camera becomes very jittery on moving platforms.
Felt some music or even ambience wouldn't have improved the atmosphere.