That is crazy you cleared it on your first try LOL , very well done ! 8.9m is higher than anything I've achieved haha .
The scoring is a race to get to max level / kill 150 enemies so that you get the increased multiplier- and then kill as many extra enemies as possible to benefit from the increased multiplier . Regarding the speed boost on hit , you get a zeroranger style knockback on hit- but you can animation cancel it if you hit a directional input during the disabled input , which boosts you in a direction and instantly gives you input back- it's easy to hit accidentally , but super consistent once you get into the habit of pressing a direction when you get hit .
Thank you for playing , and for the in-depth notes too ! . It's interesting you felt the hitbox was fairly intuitive , as it's been a fairly common complain that we'll likely have to address at some point .
Cheers Aru ! appreciate the notes a lot <3