Hi Natalie, thanks for the question.

It is possible that the deer ate the buds off the lower limbs; however, some sources suggest that deer are not all that interested in cherry trees.  The damage of the leaves is most likely caterpillar damage.  Another pest of this tree is the Japanese Beetle, but the damage does not seem to match.  Caterpillars, if feeding, can be controlled with Bacillus thuringiensis subsp. kurstaki (Btk)  sprayed on the young tree. The damage to the leaves should not be a problem.  For being planted this year it looks like it is doing well, except for the deer damage.  Continue to keep it watered especially with high temps.  Mulching the young would be helpful. Check out the following link:

Mulching Landscape Trees (psu.edu)

Watering newly planted trees and shrubs | UMN Extension

I hope this helps.