Possible strategy for level 1
Obviously getting through the first stage is now more important, but it is possible if you do it in the right order.
1. Don't be scared by the bat. It flies in your direction, but it is dumb, and will fly through and past that spot before changing direction again.
2. Because of this it is worth jumping out the way and then clearing the living room.
3. Leave the outside until the end as the demons cannot change direction without hitting a snake.
4. Snakes will follow you but their AI is almost as dumb as the bats. They are easily tricked. Try luring them into a corner, just don't get them trapped in the outer corridor or you won't be able to split them and will get trapped.
5. Demons will only catch you if you are moving - if one comes towards you stand still and they will slide past without any trouble. Just don't let a snake catch you up in this time.
Mechanics for the enemies in level 1
DEMON: turns 90 degrees then walks in a straight line, forming a patrol around the corridor. Scared of snakes; will turn if it hits one. Dumb; will not follow the player. Only hits moving players so stand still if one approaches.
BAT: relatively dumb. Points itself in the player's direction then flies in a sweeping line that direction before changing again.
SNAKE: slightly smart; will follow the player. Easily trapped in corners. Walks much slower than the player so luring is possible.