Level up !!

can you tell me what should i do when one of my robots level up

For artillery Land and Air

and what happens when level is 5/5

I think you shouldn't use it yet. When you want to use some new weapons but your robot can't cost enough, raise their cost up.

It's kinda strange question, but I like helping out :3

When one of yer mechs lvl up, update him as fast as possible ;P at least before next fight/quest/mission... Well, at least I hate wasting xp ;p

I would suggest u going into all-green(cap and hp) till 5th lvl...well, it sure means a bit harder(less durability then ones who chooses shield cards after 3rd or 2nd cap increase) fights, but at least You can customize yer mech greatly. If You dont mind playing mass-produced models, go for dmg reduce.