About Greenvale Siege

Line the valley path with towers and grind 12 monster waves before the boss smashes your castle gate.

On a computer: Click a tower icon then click a tile to build, click a tower to upgrade or sell,
On a phone: Tap a tower icon then tap a tile to place, tap a tower for upgrade menu, tap fas

Timothée described this game in a sentence on OhMyGames and the AI built it. You can make your own the same way, free to start.