Yes, you can use it in commercial projects. There is attached license in every asset.
LICENSE
Licensor grants to the ASSET-BUYER a non-exclusive, royality free, worldwide license to the Asset to integrate Assets only as incorporated and embedded components of electronic games and interactive media and distribute such electronic game and interactive media. ASSET-BUYER may otherwise not reproduce, distribute, sublicense, rent, lease or lend the Assets. ASSET-BUYER is granted right to integrate asset in any closed source project ASSET-BUYER owns. ASSET-BUYER can make derivate works, but derivate work must be clearly defined as such.