Finish levels, bosses and quests

[Kn1MS]

Is your feature request related to a problem? Please describe.
It's not a problem, it's a necessity. We can't finish the game without its gameplay core.
We need to...

• Finish first level itself
• Finish first level's bosses
• Finish first level's quests
• Finish second level itself
• Finish second level's bosses
• Finish second level's quests
• Finish third level itself
• Finish third level's bosses
• Finish third level's quests

Describe the solution you'd like
Open notepad, open tiled, work-work-work. Send the texts to dev, make him sweat for all those boss mechanics.

Describe alternatives you've considered
None.

Additional context
None.