This was an interesting entry to play! From the name I somehow convinced myself that this was a physics game, but it's definitely not that. Maybe closer to a top-down shooter, but still different? It's definitely a unique gameplay experience, so congrats on the idea!
I did find some frustration with the controls -- in full-screen, the character did not shoot towards the cursor, and not in full-screen, clicking off the game window spelt an instant game over. Since my strategy basically was "hug the left of the screen, snipe the enemy that spawns above while it's offscreen, then shoot at the enemy that spawns from the right (at first sniping it offscreen, and gradually just shooting more and more behind me)," I guess I was more prone to clicking off the window than the average player would. However, the game has an addictive quality that made me keep on coming back for more, and eventually I made it to the end. Great job on the game, and I'd definitely be interested in seeing more!