Are There English Online Games for Eon Kid? (No – Only DS/GBA)

No official free-to-play Eon Kid (a.k.a. Iron Kid) browser or mobile games exist in English. The franchise (2006–2008) released only:

• Nintendo DS: Eon Kid (2007) – action platformer.
• Game Boy Advance: Eon Kid (2007) – different levels.
• Mobile (Java/BREW): Simple 2D tie-ins, delisted.

Alternatives for Time-Travel/Mech Action

• Chrono Trigger (DS/Switch/Steam/iOS/Android) – Classic JRPG.
• Ratchet & Clank series – Sci-fi platformer with gadgets.
• TimeSplitters 2/3 (PS2/Xbox/GC) – FPS with time-travel story.
• Flashpoint Archive – Preserves old browser games; search "time travel" there.

If you want the Eon Kid experience, track down the DS/GBA cartridges (often cheap on eBay).