Thanks for playing our game!
For the first phase of the boss, you can actually hit both paws at the same time which will likely reduce the amount of hits you take by half. Beyond that, as soon as it starts blinking you should run away and then when the boss repositions on top of you dash either left or right IMMEDIATELY. The timing is hard- this was intended.
We do plan on having difficulty selection in the future and the current version of the game will likely be the "normal" mode.
Also, if you'd like to see a run of the game we just set up our speedrun.com leaderboard: https://www.speedrun.com/1bit_kitty