I appreciate the effort put into this. These are the things I want to mention.
-Like the other comment said, hint on keys should be in the game.
-I could not see the exit to the supermarket. The camera doesn't go down enough for me to see it, I was able to find it because of your reply.
-Some of the objects have their overlapping point in the middle instead of at its bottom. So the character would be on top of the object when they shouldn't.
- Add some music, don't worry that it won't fit the game, anything will be better than the silence we have right now.
I hope this helps. I got stuck at saving Colin part, not sure what to do next.
If you keeping making more, I'm sure you will become better at it :)