I think the little boy is the killer when he was young. Its alluding to the fact that he grew up alone in that house, probably his parents' house, and that he was always psycho.
Very reminiscent of Mega Man. I like this, except the controls are a little tricky...I was never very good at flappy bird. Also, flawless doesn't seem to apply to the perk if you are playing on easy mode.
One of the last clues has you clicking the light fixture in one room, and then dragging the rocket on top of it. I tried this originally and it didn't work. I think the light fixture should show a hover cursor if you hover over it, to show that you need to click it or interact with it, which it doesn't. Also had the dissappearing sneaker thing ruin my game the first time
This game has alot of potential. The controls are flakey, i.e. sometimes not recognizing keypresses too quickly. The story could use work, and ...erm, what do you use all the dollars for? Perhaps upgrades would be nice.
The three animal heads each have a bullet hole. The height of the bullet hole in the animal head, and the color of the animal head should be enough info to solve the three bullet slider puzzle to the left of the door in the first room.