v0.9.1

- Background glitches in Level1 fixed.

- Fog added.

- Main character's mass, physics and gravity scale, etc. updated.

- Obstacles and enemies now have health bars that show how many hits needed to destroy them.

- Jumpbooster platforms' visuals updated. From now on, there are more jump boosters in Level 1.

- Renovated level design.

- Dynamic Spiked Walls both on walls and in the ground!