That's a triple 5 stars for me, we went for a similar concept but your execution was just hilarious, from the name to the art to the plot twist in the end, it didn't seem like it was made in 48h, you really gave the kind a personality and made me invested in reading his thoughts every time.
Congratulation on your submission, I can't see a world where this doesn't make the top 100... atleast one of the "inverted tower defense" brothers will make it to GMTK video Haha
If I had one small criticism to make, it is that the game doesn't encourage strategy, (the opposite of what this type of game should be doing). I found myself spamming units and upgrading them none stop till winning.
Your project has insane potential, best of luck for the rest!