Love the pixel art and colour palette that fits well with the choice of music and sound effects. Gameplay is simple and easy to pick up with dodging enemies / keeping out of sight of guards.
I'm wondering if it would work if you picked up shells automatically on touch so avoid having to go through the dialogue box every time and breaking up the pace. Would be also cool to have some sort of on-screen indication of your health rather than needing to check in the menu.
Otherwise a very good presentation for a short jam game! Well done!