⚖️ SHOP UPGRADE COST REBALANCE — Texplore Steam update #152963

We've adjusted mid and late-game upgrade costs across both Earth and Moon shops to create a more satisfying progression curve. Early upgrades remain accessible, but maxing out your gear now requires real commitment. Drill Power Level 3: 3,900 → 5,000 Level 4: 6,000 → 12,000 Level 5: 10,000 → 25,000 Armor Level 3: 5,000 → 8,000 Level 4: 15,000 → 20,000 Level 5: 25,000 → 40,000 Jetpack Fuel & Jetpack Strength (both) Level 3: 2,000 → 3,000 Level 4: 2,750 → 5,000 Level 5: 3,500 → 7,500 Level 6: 4,250 → 10,000 Level 7: 5,000 → 14,000 Level 8: 5,750 → 18,000 Level 9: 6,500 → 23,000 Level 10: 7,250 → 30,000 Health & Storage Upgrades Cost per level increased (step: 1,500 → 2,500) Level 1 still costs 1,000, but each subsequent level now costs 1,000 more than before Cannon & Laser Level 3: 7,000 → 12,000 Level 4: 10,000 → 22,000 Level 5: 20,000 → 40,000 Missile & Bomb Level 3: 20,000 → 25,000 Leve...