Nice game, kind of hard but with enough practice and luck you can win.
Since I don't know the exact vison you have for the game I'll just give my ideas and thought since I like games that can be played more than once. 1. You should for sure add a difficulty selection (Something to change unit pricing and tone down enemy power kind of like a beginner mode for learning) since it seems the current state of play is a bit on the harder side for newer players to pick up, this would allow people to play just the base game (If you ever plan on adding challenge runs like all zombie units or modifiers) multiple times trying to beat old high scores and learning new tricks as they ease themselves into new difficulty sets. 2. I feel Blood is a bit lacking after a certain point in the game once you know best unit placements and you max out all the levels for them, maybe a blood over shield for tombstones or something very pricey would make it more interesting. 3. As for the rest of the game I feel you have an amazing base structure and grasp at what makes games of this genre good, enemy units are challenging, you have future units, mobs, and items planned, and I'll for sure be there to beat the game again and give feedback. Thanks for taking the time to give this a read and have a great day/night.
Thank you very much for your feedback.
1. I want to add a progression system that slowly increases the difficulty to make sure more players can enjoy the game. If that's not enough, I'll have to add something similar to your answer to this problem (difficulty slider).
2. I totally agree. Blood doesn't make much sense in the end game. I have some ideas on how to fix this, but they're not ready yet ;)
3. You don't even know how much these words mean to me. You are the first stranger who said something nice about my project. Thank you very much.
Have a great day/night :)