Insane anime girls with guns, what's that type called? Did couple of runs with your nuns and their guns, pistols too high, flashing lights from shooting pistols were super bright, my screen's life has been cut short by it. Demons are a little too fast and I don't know if that's your intention but they tend to gather in one place if you're far away and then follow you like a tsunami. I thought the level is a little small but with gravity mechanic it actually doubles so that's fine. I managed to snag 3 hourglasses, I couldn't find more, I was thinking that maybe with higher combos you could increase the time on its own? A little bit of explaining how to extend time could also be beneficial, my first run was "successful" after one minute and then I'm back at the start screen with the lowest score imaginable. Also add sound that you're taking damage, my screen flashes blue, I'm running forward and there's nothing to do, I turn back and to my awe, my ass is chewed by dozens of demons.
The game reminded me of Devil Daggers a little. It depends what you're trying to achieve but I would keep it relatively simple and put a low price on it, just like Devil Daggers.