Very balanced. Campari seems a little heavy for me though, and I usually like bitter drinks.

Could use more sugar or something else

I wanted to like this shot, but it won't fit in a standard shot glass. Gonna experiment with the proportions.
Definitely too sweet for a shot. Here's what I like so far.... (and will fit in a shot glass): 1oz Vodka, 1/2oz Lime juice, 1 Bar spoon (~.15oz) Simple syrup, 1 Bar spoon (~.15oz) Black raspberry liqueur