Hi! Sorry for the late answer. As stated in the licence this asset can be used for non-commercial or commercial project. The subject of the project is entirely up to you.
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There are 3 hairstyles, each in 5 colors, plus a helmet, also in 5 colors to match the armors. There are 5 color variation of the armor sets: grey, white, black, gold and red. The cloth's color on the armor also varies, mostly red, blue, purple, white etc.
The assets (Animated Pixel Monster Pack Level 1 by NamiPixels) can be used for non-commercial or commercial project. Asset may be modified. Modified versions must be plainly marked as such, and must not be misrepresented as being the original. The assets can be used for multiple titles. The asset itself cannot be freely shared or resold!
2) You can find the background tiles here: Pixel Cave Tileset. For similar packs take a look at the creator's page.