My idea is to have all sorts of diff cats and crew members who can join you and you can grab new members as randomized selection at outposts or refuel areas! anywhere you can dock and is like a city area you can get new members! for balancing maybe have a limited crew size and space? I really would prefer there not be a happiness system as it would just be a bad feature! more like certain crew have their own perks per cat and some are better with the engine or better for weapon aim, etc Another idea is to have more room or weapon choices like a super OP laser that fires in a single line once then has to recharge for like 20 turns so its a tiny use one so its rare to see used but when its used its super powerful or have some sort of rapid fire laser cannon that does less damage to shields but shreads ships more or less make it so players need to analyze their enemy to figure out weapon types and learn the counters! or have some sort of boarding mechanic for large ships be able to go inside them and take stuff as like you were seeing your own ship inside!