Very nice. I beat it! Didn’t expect it to be reverse tower defense, very cool concept and solid execution.
I do think there is some kinks in the design though. Namely, you are incentivised to spam basic units way too much to gain money. Once you realize that the more you spam the more money you get, the game becomes easy. Not sure how to fix such a thing, maybe someone with actual design experience could give you actual advice.
But yeah, otherwise, the game has a ton of content for game jam, good job! And extra points for including a ton of extra things like the glossary for the all of the game’s mechanics.