I think the level size is perfect for the fast paced game it is. I feel like the blood bar has too much initially and I feel like the bat ability should cause more blood to go away or the blood should go away faster in general because the bat ability can be abused to get blood packs easily and take little to no punishment for using the bat ability. I would like to see a powerup that lets me push the enemies away, I feel like that would be an interesting mechanic to add to the game. The movement of the horde is perfect, I really like how it follows you around rather than just moving in a straight line. Other stats I would like to see would be the current level I am playing. It would be nice to see what level I am in while playing the game. Yes, I think the score helps increase the replayability of the game because it allows for a different goal rather than just living or getting to the next level. I am not sure what you guys mean by a permanent max blood powerup but I believe adding another powerup to the game would be interesting. As long as it isn’t a broken mechanic and the levels get significantly harder where the powerup is really useful to the player.