The game is very poorly balanced, looking at Steam achievements, only 24% of people completed the game, why? Well, the combat is ridiculously unbalanced. My first play through on easiest difficulty saw me die over 15 times against the first boss, but not die once against the last. If you can get past the first two bosses the game becomes easier. The same on medium difficulty, get past the first two bosses, and you can play the rest of the game without dying once.
Progression
As you progress you gain more skills and equipment, but the difficulty doesn't get much harder, so the effectively the difficulty drops as you progress. You will gain enough skill points to unlock all of the skills in the game. I was left with 11 unspent points on my last play through.
Changes
I would make the following changes to the game.
* Nerf the first boss.
* Once you have all of the skills, turn off the reminder that you have unspent points.
* Give an option to turn off damage floaters.
* Fix the quest "Scan the alien body", so that if you either do it, or optionally don't do it, the text is removed from the screen, it currently stays on the screen for the rest of the game unless you die.
* Add more save slots, so more than one person can play the game on the same machine.
* Stop taking control of the character outside of cut scenes, I would either like to skip a cut scene, or play the game, don't take away my control during play, because it throws me out of the game.
* The improved weapons are better than the original ones, why are we carrying the old weapons around?
* Change the fire based weapons, so that you can power up shots without lock on, if I miss, I miss.
As a final note: The tag Horror doesn't really apply. I don't know why the tag "Sexual Content" is there, as there is no sexual content in the game. Do people think the female characters are in a relationship, because there is no evidence of this?