Do we need a game engine?

Not always. For small games Canvas 2D or WebGL is enough without a heavy engine, and the page loads faster.

Can the game be embedded into an existing site?

Yes. The game can be added as a separate block or page without touching the rest of the site.

We design controls for touch and keyboard from the start instead of reworking a desktop version later.

Mini-games and interactive promos that launch from a link: with physics, sound and controls on any device.

Idea and mechanics
We define the goal of the game, the player main action and how success is measured: time, score or reach.
Prototype
We build a playable prototype with basic mechanics and check that it is fun to play.
Development
We add graphics, sound, levels and records, and tune difficulty and performance.
Launch and support
We publish the game, package it as a PWA (a site that installs on a phone screen like an app) if needed, and watch for errors.

An isometric kitchen on a 404 page: light the coals without starting a fire. Heat, fire, water and shadows are calculated in the game itself.