Thanks for your feedback, and I am glad you enjoyed it!
The two main design decisions:
1. Enemies will be affected by your upgrades.
2. You need to guide enemies' paths to let them pass/avoid portals.
They are both what this theme inspires me to introduce to the Vampire Survivor Genre. The fact that it turns out to be unique and fun already makes me excited.
I understand that some upgrades do not feel effective enough and are not able to keep demolishing tons of enemies. These are things I need to solve in the future version, and they are indeed what makes Vampire Survivor Games fun to play with. I will work on the numbers and upgrades to ensure future versions satisfy the players even more. Thanks for playing again!