Thanks for testing and for your feedback :)
We also really liked the boss, the art was inspired of the little automated vacuum cleaner x)
I can understand that it would have been more of a rhythm game to punish off-beat attack, but we kinda wanted the rhythm to be just a bonus for the player. Rhythm game are a particular category since it won't be the same "difficulty" for everyone, some people feel the rhythm some other just don't. And some of our friends testers proved that to us haha. So we didn't want to exclude some people from having fun on our game because of that. But that was a big subject during this week hehe. Thank you !