I've been building a collection of browser-based arcade games and just shipped v2 updates for 9 of them. Each one got a core mechanic overhaul that adds real depth beyond the original prototype.

Here's what changed:

🏰 Tower Defense — Tower upgrade system (Lv1→3, +120% damage), 2x speed toggle. Strategy went from "place and pray" to "upgrade path matters."

⚔️ Dungeon Descent — Full roguelite meta-progression. Die → earn Souls → buy permanent upgrades (HP/ATK/DEF/Potions) → go deeper. The Hades loop.

🐍 Snake Arena — AI enemy snakes that hunt food and avoid walls. Kill them (+25pt), headshot them (+50pt), or get eaten trying. Ghost powerup for stealth kills.

🧱 Brick Breaker — Combo system (2x→10x multiplier for consecutive hits without paddle). Screen shake, color-shifting ball trail, 10 levels. Score chasing is real now.

🎵 Beat Rush — Fever Mode (30-combo → 2x score), Hold Notes (new note type), Speed Ramp (1x→1.5x as song progresses). Three difficulty tiers with separate high scores.

🔨 Whack-a-Mole — Helmet moles (2-hit), Frenzy Mode (10-combo → 3x score), Golden moles now give +2 seconds time bonus. Risk-reward everywhere.

🏃 Pixel Runner — Shield & Magnet powerups, distance milestones (100m → score multiplier up to 5x). Surviving longer = exponentially more coins.

🚀 Space Dodge — Star collection (+50pt), 3 powerups (Shield/Slow-Mo/Magnet). Pure dodge → risk-reward decisions.

🏭 Coin Factory — Prestige system (reset at 1M coins → permanent +25%/level bonus) + Golden Coin events (100x click, random spawn). The idle game core loop.

All free, all browser-based (mobile-friendly), no downloads needed. Built with vanilla JS — no engine, no framework.

Would love to hear which mechanics sound interesting, or if you spot anything that could be better. Happy to talk game design choices!

🎮 Full collection: https://maxmini0214.itch.io