I don't know how but it was almost playable during one of my attempt. Anyways it is almost impossible to play with an AZERTY keyboard (going left also switch lens continuously and make the game lag a bit). When I switched keyboard for a QWERTY I couldn't cast spells (the arrows didn't work). I didn't manage to cast a single spell :( they are way too long (but I'm already bad at bullet hell games so with broken controls I has no chance)