Underrail is only very "strict and unforgiving" in one sense, there are three ways to play and virtually no room for deviation on those three "trunks"
-Heavy armor, high con, guns/hammer/(formerly psi), *
-Light armor, evasion, stealth, high combat/psi,*
-light armor, stealth, high subterfuge, *
Following those, underrail is actually quite easy and forgiving even with terribly chosen feats.