Difficulty tuning

[endrawes0]

Current tuning surfaces

• Card stats and shop economy live in data/balance/basic.tres.
• Encounter layouts and scaling in data/encounters/*.tres (rows/cols/base_hp/speed_boost).
• Threat calculation and per-floor scaling in scripts/Main.gd and scripts/managers/EncounterManager.gd.
• Ball/paddle speed

Suggested work

• Review damage/threat curves across early/mid/late encounters.
• Rebalance card costs/effects and shop pricing vs reward frequency.
• Adjust speed boost chance and boss parameters for smoother ramp.