This is a really good start! The concept is really fun, even if there really isn't much here yet, so I couldn't give a super high score. However, a few notes:
- The art is nice, but a background would have been appreciated. A bit more cleaning up would have done nicely, too.
- It's a bit easy, since all you have to do is reach the biscuit and you have multiple paths to do so. Maybe if you had to grab the biscuit and then get back to the start?
- What are the blue areas for?
- The grandma gets stuck on the bottom-left corner.
- A bit of audio would be nice, even just a bit of music - there are lots of places to find royalty-free music and sound effects!
Overall, I think this is a nice proof of concept, and if you expand on it you could probably make something solid. I think that adding more levels would be a nice start, maybe introducing a few more mechanics, and generally adding a bit more art (even if it's not the best) would really bring the game to life. I look forward to seeing what you make in the future!