Hold back hoards of cats using rocks and upgraded cat-corpses!

Hey BUDS, here's a game Molkman and I have been working on for way too long.
"Hold back hoards of cats using rocks and upgraded cat-corpses!"
Sorry for the huge file size, be patient.
We suggest you don't skip the tutorial.
Hope you enjoy it.
Menu by Nicole Cash - nikkinack.deviantart
EDIT 1:
Getting some feedback that it's too hard.
Just shoot faster! It's eaaaaasy!
EDIT 2:
If you still think it's too hard, upgrade your slingshot, it helps a bunch.
EDIT 3:
You can CLICK a bit further away instead of dragging, TRY THAT YA BABIES. ):