As of recent years:

It is important to note that while playing open-source clones is perfectly legal, playing a direct rip of the Steam game hosted on a shady website exists in a grey area.

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Most portable versions are 20MB to 100MB. This loads into your RAM, not your hard drive.

Independent developers have uploaded "Jump King-likes" to Itch.io with "HTML5" tags. Some are direct homages; others are parodies. Filter by "Play in Browser" on Itch.io and search "Jump King." You will find dozens of portable versions. The advantage here is that the developers often credit the original creators.

Your progress can often be tied to a cloud account or a simple URL, allowing you to jump anywhere. How to Find a Reliable "Jump King" Browser Version

Are you trying to play on a with restricted access?

For the true portable experience, consider this: Jump King is already portable in your mind . The agony follows you wherever you go.