I like the concept, but the game's pretty tough, or maybe just not well-tutorialized. I only managed to get through the first wave once, and I could only afford a few upgrades from it, not enough to survive the next round.
Thanks for the feedback! You're very right, the first wave is unintentionally the hardest one at the moment. There's a delicate balance between protecting yourself sufficiently and generating enough mana to get good upgrades, which I plan to explain more in the tutorial in future versions.
