Intense and engaging! The inclusion of a leaderboard is a nice touch, and trying to aim the forced auto-fire bullet so that it ricochets into an enemy early on was a nice challenge.
Two things that would make the game more fun: first, a faster manual fire rate. When I was surrounded by close enemies, I couldn't quite fire fast enough to pick them all off. Second, an explosion graphic/sound effect for when the player dies would help convey how they got defeated. So many times I wondered, "what even hit me?"
One last thing worth noting is that the player acceleration is very fast. Most of my deaths came from me slamming into enemies and bullets, rather than them slamming into me. Maybe that's something worth tweaking.