Why HTML5 Game Submissions Get Rejected (And How to Avoid It)

Rejection reasons vary in wording between portals, but the underlying causes are almost always the same handful of things. Knowing them before you submit saves a review cycle — most turnarounds are days, not minutes, so a preventable rejection costs real time.

Rights and licensing

The single most common rejection cause. Art, audio, fonts, and code libraries all need a license that actually permits commercial redistribution through a third-party portal — "I found it on Google Images" or "a friend made it" is not a license. Asset packs bought from a marketplace usually are fine, but read the specific license terms; some restrict redistribution inside a game that runs on someone else's domain.

Ad SDK conflicts

A second ad network's SDK left in the build — even inactive, unused code — is a common flag, because portals can't verify it isn't also serving ads or tracking players. Strip any competing monetization SDK completely before submitting, not just disable it.

Reward logic that doesn't match the ad lifecycle

Granting an in-game reward on ad click, ad request, or ad close — instead of on genuine completion — gets caught during review and is treated as a policy violation, not a bug. The reward should fire only from the SDK's completion callback (for example onReward), never optimistically.

Technical failures reviewers actually hit

• Build doesn't load at all in a clean browser profile — often caused by hardcoded localhost URLs or absolute paths that only work in local dev.
• Game requires an account, external app, or a service that isn't reachable during review.
• Broken on the first input a reviewer tries — reviewers don't debug your game, they report what they see.
• Missing or placeholder thumbnail/description — signals an unfinished submission even if the game itself works.

Content and audience fit

Most portals run mixed-age, ad-supported audiences and reject explicit content, real-money gambling mechanics, or anything that could create legal exposure around minors. If a mechanic is borderline, it's worth checking the specific portal's content policy before investing more build time in it.

See PlayKovo's full technical and content requirements in the submission rules — most of what's listed there maps directly onto what other portals check too, even where the wording differs.