different gameplay functionalities to learn UE4
- youtube battery collector tutorial: https://www.youtube.com/watch?v=mSRov77hNR4&list=PLZlv_N0_O1gYup-gvJtMsgJqnEB_dGiM4
- landscape and foliage
- spawning objects by the player in different ways
- inventory
- particle system: laser beams, battery electricity