Reverse Tower-Defense is pretty fun and rarely see them so this was a nice change!
The balance is a bit wonky though once you learn the swarmers have the best ratio for cost/income increase. Just mass them until you can afford an armor upgrade and 4+ Taurens per wave and it's basically auto-win.
Still really fun and definitely a strong foundation for a more fleshed out game if it's development is continued post-jam!