The choice to turn into a bat and fly over the blood was really great. That being said this game is really tough because you can only be a bat for barely any time and then there's a large cooldown. I didn't make it to the upgrades unfortunately.
Well you are not supossed to be in the bat form at all the time. The cooldown is also large because you used up all the stamina . If you leave the bat form before the stamina runs out you can instantly use it again. Thats to prevent you being in the bat form for too long.
