In the past was easy to program websites like videogames with the "flash plugin" (now discontinued for security reasons).
Here the gameplay of the first flash version of my website i did in 2002.

00:00 Intro
00:18 THE DESTROYER's HOMEPAGE!
01:03 Mini Sampler Live
01:48 Insects Background
02:50 Password Found!
03:09 Thirth background was actually an impossible minigame!