Thank you for playing and going through the instructions! I know the game does not explain itself too well atm, a proper tutorial is in the works.
I do not plan on adding unit XP-based levelling, partly for scope reasons, and partly because I want to try something different. Units will gain additional abilities only from the gear they pick up which I hope will allow more build flexibility and experimentation for the player. Do you think a lack of XP bar may be a turn-off for rpg/roguelike players?