Thanks for playing and your comments! Having one of the seasons break up the game arena is a really interesting idea. I wish I'd thought of it for the jam, as three of the four seasonal enemies are functionally identical. It also would have helped the difficulty curve not ramp up quite as quickly. I realized the difficulty curve was really tough after I submitted it (I thought it was going to be easy, which is why I added a hard mode). If I could tweak it a little, I would have made the normal mode the hard mode and made something easier (if just a lower, more reachable target) the easy mode.
I made sure to not let the enemies spawn too close to the player. It's no fun when you die to something completely out of your control. One of my goals was to have everything (mostly) predictable for a player, so theoretically someone acting perfectly could play forever (until the screen filled up with enemies).