A very interesting concept, but I found the most effective strategy to just be spamming units constantly. Because of the lack of control you have of anything, the game doesn't really have much strategy besides what units you place. However, I still somehow found game this quite enjoyable and satisfying, but I'm not entirely sure why. Maybe just creating a total bullet hell for the hero stimulates the "numbers go up"-part of my brain lol, so clearly you did something right that I didn't realize.
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Yeah, this is very much a "proof-of-concept" in its current state. Having cooldowns would hinder spamming the same unit and increase the strategizing needed. Interactivity is definitely something that could be improved as well. Glad you found it enjoyable, thanks for checking it out and for the feedback!