The game is not particularly hard, but here is a list of endings with some hints on how to get them.
No spoilers, but you may want to try and get them yourself before reading this.
End1: Frozen
Eat the food in the freezer.
End2: Capture
Enter the freezer but do not eat. Open the simple wooden door in the living room.
End3: Stasis
Open the simple door in the living room and get closer.
End4: Rescue
Open the simple door in the living room and back away.
End5: Escape
Drink from the pond in the greenhouse and open the glass door.
End6: Monster
Open the simple metal door in the greenhouse and advance all the way.
End7: Trap
Open the simple metal door in the greenhouse, but turn back. Go right in the tunnel.
End8: Freedom
Open the simple metal door in the greenhouse, but turn back. Go left in the tunnel.
*Note: If you're having a different ending or being forced along another route, chances are you entered the freezer. That influences other events, so make a new file and don't go there.
No spoilers, but you may want to try and get them yourself before reading this.
End1: Frozen
Eat the food in the freezer.
End2: Capture
Enter the freezer but do not eat. Open the simple wooden door in the living room.
End3: Stasis
Open the simple door in the living room and get closer.
End4: Rescue
Open the simple door in the living room and back away.
End5: Escape
Drink from the pond in the greenhouse and open the glass door.
End6: Monster
Open the simple metal door in the greenhouse and advance all the way.
End7: Trap
Open the simple metal door in the greenhouse, but turn back. Go right in the tunnel.
End8: Freedom
Open the simple metal door in the greenhouse, but turn back. Go left in the tunnel.
*Note: If you're having a different ending or being forced along another route, chances are you entered the freezer. That influences other events, so make a new file and don't go there.