Really fun game , nice job!! Core mechanic is great and the unlockable upgrades are a good touch, the present cluster bomb was very fun to use. Slingshot mechanic feels intuitive and responsive, with great bits of juice like the way the present tumbles through the air and the slight screenshake when hitting something. UI could be improved but its only a couple day jam so totally understandable (I didn't dock you points for it). Great entry, fun core gameloop, keep up the good work!!
edit: high score of 61. Also, like another comment said having to wait for the "no score" text was a bit annoying as you want to get right back into throwing a new package with the slightly different angle that is "definitely going to work this time". Maybe skipping this transition part when the player clicks and drags to initiate a new throw would work?