I love the idea of the grandpa guiding silly little Timmy on the quest for revenge, really original. Once you get the hang of it, the gameplay is really fun, a lot of trial and error but very rewarding once you figure it out. I had a bit of a hard time noticing the markers for actions, I noticed that I can only make one change in the beginning, but did not know why.
The only real issue I had was the typing sound for the dialog, that was really hard on the ears straight at the beginning, especially compared to the soothing music.