It's a pretty cool concept playing as a character that starts to "rewind" in age.
I really like how each of the characters has their own unique projectile, such as the cigarettes for the old man, the gun for the adult, the nerf gun for the kid, and the pacifier for the baby.
There are a few things that I feel can be improved though.
The enemies seem to back away whenever they reach my player, and touching them doesn't seem to do anything. I would have liked if there was some sort of dangerous enemy that felt threatening against the player.
The way each of the characters plays out feels kind of feels the same, other than their hitbox changing size and a slightly different shooting speed. I would have liked it if each of the aged characters had unique special abilites.
To think of a few:
The elderly could ride around in an electric wheelchair that can run over enemies from the front. It controls differently than walking around since you rotate around like a vehicle instead of instantly turning the other direction.
The adult throws taxes at the enemies which causes the police to appear and arrest them for tax evasion.
The child can run around quickly while whacking enemies with a baseball bat. Any enemy that get knocked back by the bat become a projectile that damages other enemies
The baby uses a crying ability that gets enemies to back away from it, but the character movement is slow since it can only crawl.