The visuals are simple, but I think they work really well. For example, I liked how the cursor leaves a trail when you move it, and the animation of the enemies “exploding” looks nice too.
Other people have already left some great ideas in the comments, but since you asked for feedback, I’ll add my contribution as well: maybe you could introduce different enemy types that behave differently, like changing trajectories or shooting projectiles to distract the player.
Hope you have fun continuing to work on this game!