Cool game, smart aesthetic choice, probably made the assets very cheat to produce while also being very clean and retro.
If I was to redesign an aspect of the game or make any change, i would remove the dash and add some subtle movement on the deflect itself. It is cool and reminds me a little of the ori projectile redirection mechanic. Maybe it could do a little dash and this dash is the area considered for the deflect, or the deflect itself could add momentum to the player so i have to be careful on my positioning after a deflect. The dash I think only added noise and didn't reinforce the feeling of slickness the deflect was going for.
Also, I feel like the projectile bouncing off walls could be better explored. Maybe add enemies that don't shoot pink bullets and are kinda hidden behind a wall, so you have to deflect another any and bounce it on a wall to defeat the hiding one. Or maybe add some enemies that shoot bouncing projectiles as well, so you have to reflect back with a bounce.
Great entry, good job!