So much detail for such a short time period. I really like the idea that you have to switch between characters to complete different tasks. The art style is also on point, and really ties the game together. Also I know you didn't create the music, but the track you found is sick.
However there were some small things that would improve this game a lot. For one the controls were a little awkward for me and I couldn't really find a position to comfortably press all the keys accurately. Another thing was that grandpa was a little too slow. I appreciate the different speeds for different characters, but playing grandpa became painful because of how slow he is. This is probably just because I am impatient, but most of the times I died it was because grandpa was moving too slow for me. Also the text was a little hard to read at times.
Overhaul great work, I hope to continue to make games in the future.