Hi! thanks for trying out this game. If you're interested in playing more I can invite you to the discord where we have multiplayer matches too.
1) thank you
2) Yes there's a lot of experimentation trying to get the game easy to use and understand. Lots of trial and error. thanks for your feedback!
3) Pilots will level up and their level will unlock new skills or moves. (both for roguelike campaign mode and separately for multiplayer PVP)
4) yes you will also be able to select skills for the pilots when they level up, as well as some modifications or equipment, cosmetics for the units.