Wow, such a good game. The mechanics are simple & satisfying, the boss was fun, holy cow how did you make this in 2 weeks by yourself??
As a fellow solo dev you should be super proud. It feels really polished.
The only suggestion is that the enemies (besides the boss) are super non-threatening since you can spam attack. If you continue working on this (hope you do!) maybe introduce a cooldown on attack or just a different enemy type... I dunno but great job!