Hydra was my entry to LD7. The theme was “growth”. It’s a top-down shooter, where you play a growing hydra.
At the start, the hydra is merely a small worm – and even a single knight who has set out to kill you is a dangerous foe.
Some levels later and after eating lots of knights, the Hydra has reached quite some size. But, there’s now also more knights, and they also got bigger and stronger.
The final form when you win the game – I doubt anyone ever has encountered this without using cheat codes.
Download: original LD7 submission (no idea if it still works on modern systems)