I like the game! I only played version A but I think you should add a death animation to enemies. I also think a status window would be nice so you can see how many times you bought health and dmg upgrades.
Very cool project! I was wondering if you would maybe wanna work with me as I need to build a portfolio. We can add discord or something but I would love to tweak/add graphic designs to your itch.io page! let me know if you wanna do something. This is free, I just need more experience working with people