I've seen this during the GMTK streaming, and it's great. I think there is a design challenge there, where ultimately, to go to the high score, I could position myself in a queue and then take a turn to shoot the previous iterations of myself. That way, it's almost guaranteed to win. A solution for this would be to ensure that you are always moving. Maybe, in some future levels, to introduce random enemies that force you to take a different path. Overall, great job. I'm sure this will get featured with the winners.
I've worked on a "Monopoly meets Tower Defence" game called Venture Forth, and I would appreciate your input. It's definitely a slower paced game than this, though haha. Thank you!