Pretty short I'll say. However, you did leave a few quirks inside the quest. Let me write down what I noticed:
1.- Was a pickup string supposed to be shown when you get the Slingshot? Link stood there for a moment until I pressed A. If that was the case, the string didn't show.
2.- Check your ammo drops. I had three times where an enemy dropped a "30 seed" ammunition, but it only gave me 6 seeds when I picked it up.
3.- A suggestion. When players get the Slingshot, you should at least give them full ammunition. It can get kinda tedious hunting for ammo on an empty weapon. Trust me, people will thank you for this.
Other than that, not bad. Are you going for an NES style quest?
I rated this a 3/5, given it's only a demo, and this isn't enough for a full review (obviously). Still, nice for a small pass time.
This is the first demo, contains the Kokiri Forest and the Deku Tree (level 1). Most scripts are already in place, but future versions may break your save as I add the few that are left. Should be bug-free, but it's entirely possible I missed a couple.
EDIT: This download is outdated. Use the most recent demo.