Hey thanks! :)
I am for sure keeping experience mode. I want to allow players to modify lots of things with few presets already in. And personally even though I do like challenge when I play a game, I sometimes wish that games would allow me to just go straight through the gameplay sections to allow me to learn the story. Or to allow me to enjoy some bits of the gameplay without worrying that I will have to start from last checkpoint if I do something wrong.
And good suggestions. I already have similair things planned to add - I will be going full time with it very soon and then there should be some updates coming with new stuff. New levels, mechanics and new enemies. That "feeling bad about killing those little guys" is one of the things I wanted to have and that will be part of the gameplay and story. So that's actually good that you feel bad about that :)