You took on a very challenging concept. There’s a lot of UI/UX difficulties with shaking the mouse to connect the dots and I bet you have a lot of ideas now of how you would have done it differently.
However, you got a game out and it’s cohesive and easy to play. It follows the theme on point and is pretty unique. Well done!
As for recommendations, it’s hard to say. I would offer Okame as an example of user inputted strokes and drawing based combat. Momentum might be something to look into to make ‘flailing’ feel less of an option, but I’m not confident that would be the right answer.
You hit a great concept! Be proud of what you submitted because it’s great!