YOU CAN MAKE A BUG TO FALL SLOW, JUTS CLICK UP AND Q ALL TIME

Reminded me of that one duck game I can't really put my finger on. The sword is useless against the bats. Just make it a minigame instead of a boss-type thing.

I hate spanish

attacks should kill in one hit, you hit the bats once, bounce & take damage anyway. the range could be slightly increased too so it feels right.
not bad for your first try, props if you did the artwork, it's not stellar but you put in the effort which is good.
best of luck improving

The game is good, it's just so frustratingly hard. It just feels like there's no way to dodge the boss aside from when he's in the air, and still by that point it a slim chance you'll get by without getting damaged. And whenever I try to attack a bat it feels like I get damaged whenever I'm trying to attack it. But just to reinstate my opinion, it's a good game and concept, but for me it could be a bit easier, not sure how everybody else feels about the difficulty.
Also maybe add a menu button in the Game Over screen.