Screen frozen after third death. Nothing happen, no menu, no pop up screens.
Bad fonts. You can leave this font for Title but choose something more useful for buttons.
Will be cool to have double jump.
You need to correct hero's collision box. Now it looks unnatural. Bullet or crab hit empty space near the hero.
When hero dead he must lie on the ground. Now he flying in the air.
So it's not bad game but needs work to be good.