Many Struckd features are currently supported, but not all of them. If you come across any issues preventing you from creating your game, feel free to share some feedback with us on Discord.
As for the assets, Game Exporter supports a subset of our assets catalog flagged as “Unity Assets” in the App. You can find them in the “Unity Asset” category of the Asset catalog highlighted by a Unity icon. We will add more Unity Assets in the future. In addition to that, it should also support the new assets replaced in 2023.
If there's an asset not supported by Unity, it will be replaced with placeholders on import. Some assets which are required to run the game (e.g. characters) will be auto-replaced with similar assets if the original assets should be blacklisted. For example, teen boy can't be exported, so it'll be replaced with another character.
Other blacklisted assets will be replaced by cubes with different textures. You can check some examples in the image attached below: