+1 for using Unreal Engine. I shared an example point cloud import and some links here: Kevin N. Murphy - Nice to meet you all - #5 by knmurphy
This is showing some TouchOSC control stuff as well as LiDAR point cloud use, Unreal Engine UE4 / Lidar Point Cloud / Leica BLK360 / OSC Plugin Realtime Automation Ipad / Iphone - YouTube. Unreal Engine 4.27 supports .laz and .las but he’s on an older version (4.25) in the video.
One great thing about using UE is they have the starter maps where a player pawn is already setup and mapped to controls etc so can get you going pretty quick. There is a pretty rad pixel streaming feature that got polished up a lot. That would let you deploy the ‘game’ you make but stream it to mobile devices like iphone/ipad through a web browser and in browser controls. Pixel Streaming | Unreal Engine Documentation
LiDAR Point Cloud Plugin | Unreal Engine Documentation
Excited to see what you come up with!