This was a ton of fun. You've made a great set of upgrades and the pacing felt just right. That said, by the time I'd reached level 8, there was so much happening that it was slowing down the game pretty badly in the browser. Not sure how you'd address it in pico-8, but it might be worth digging in to figure out how because I think you've got something really special here. It's another one of my favorites from the jam so far!