I've tested https://kherrick.github.io/sprite-garden/ by pressing, "W", "↑", or "space bar" to get started moving in the game. Afterwards the other functionality seems to work as expected in Firefox on Linux with the following versions:

- 140.3.1esr (64-bit)

- 143.0.4 (64-bit)

- 145.0a1 (2025-10-02) (64-bit)

Are you able to describe what issue you are seeing in particular?