Really nice use of the theme and incorporating it into tower defense. For some reason enemy's stop showing on screen when i killed the red vampire.

Quite hard at first, but when you get it, it satisfying.

Only one resource beiong blood respects the limitation. I tried playing and at first didn't understand how to make towers because the blood is just a number on screen instaead of a clearer indicator that shows it's being sonsumed when building towers. After a while of building a defense there is not much to do, and since there is no music, it feels a little dull in the end.  Good job ob finishing a game!

Nice variety of enemies and tower types, and the difficulty progressed at a good rate. After I beat the red demon I think the game ended (but kept trying to spawn more enemies), but I was hoping to keep going!

i didnt quite get the mechanics first time around but figured it out, a tutorial page or something to tell people what to do  might be helpful

Some small details: A fullscreen and the ending screen would add to the game, or stop the counter after wave 7. Besides that, nice implementation of limitation, cute little game.