I really liked this! The artwork is great and I think the controls compliment the bullet hell gameplay well. The music was also very fitting of being in an abandoned creepy robotics factory... I do think you can make Leo a harder boss by increasing his damage towards the player.
I think the camera moves a bit too fast at times, especially when moving the reticle from one side to the other, it becomes jarring and made me disoriented.
The NPC:s are neat, you got really creative here which I like.
This games reminds me of Enter the Gungeon a bit, which is a good thing of course, but I think the dash would feel better if it was in the direction the character movement instead of the direction of the reticle. But that may be just me!
Overall, great game! Keep it up