So straight to the point here are reasons why it needs to have 3 rooms.
1.- it looks cooler and is mostly aesthetical.
2.- it makes it possible to avoid infinite combos by the ufo user.
3.- it adds the opportunity to run from the ufo user and the aliens.
Now for the changes and balancing, make it so 6 aliens spawn instead of 3, but they spawn slower and they are weaker, and since the map will be bigger they will be spread across 3 rooms, 2 aliens per room or you can tell me if its better if they roam the ship, also while in lockdown they cant ragdoll and they do less dmg.
to fix the problem of most abilities not reaching it, ufo should have fuel or energy that goes down when you fly, it can fly for 45 seconds and it needs to land for about 15 seconds to refill.
and lastly remove the notification that tells you when someone is in your ufo, so people can sneak in your ufo and kill the aliens eventually killing the ufo user
The small aliens dont attack players on sight, but in the control room where the ufo owner will spend most of their time, there will be 2 buff aliens (ofc they are weaker than the one we have now) this ones will attack on sight, and can ragdoll but they can be killed in 5 punches and do 6 dmg per hit, also small aliens dont attack on sight and wont attack until lockdown is active.
For autodestruction the timer needs to be increased to 25 so the user can reach the escape pods
Thats basically all, but please even if you arent going to increase the alien count, increase the ufo´s interior, since its really cramped and all the times i have died to a ufo have been because i get inf combo´ed on the wall.
ill leave a link on how the ufo interior should look like, Credits to RIP_rooonym for making this game as a concept, and go support his suggestions.
Ill let you decide if this changes are good or bad.