Cosmo's adventure.First planet

Jan 12, 2021

The following bugs have been fixed:
- work grouncheck on platforms
- problem with freezing in place of the enemy after death
- a problem with the appearance of textures over the portal
- error of receiving 3 units of damage from the enemy when touched
- added new sounds
- levels are checked for passability
- fixed the problem with the ability to fall through the lava
- fixed the problem with guns layers
- fixed the problem with Cosmo start position