[EPIC] As a PLAYER I want to have proper leveling system so that I can be constantly challenged and be kept in the flow channel

[chektien]

This is a major undertaking to design and create a levelling system.

• Completed design of the system #10
• Implemented level 1: Tutorial #5
• Implemented level 2: Intro core gameplay mechanic of steps to HP #9
• Implemented level 3: Intro survival gameplay mechanic
• Implemented level 4: Intro battle gameplay mechanic
• Implemented level 5: Intro boss gameplay mechanic
• ...