After 2 hours and a half, I've finally completed the game.
I'll be honest, the game felt a bit easy...or perhaps I simply am used to hard games.
Once you get to the xenomorphs, the game may feel hard, but fear not, for Shield skill is your best friend! Literally use that and you're untouchable in the almost entire end-game.
However, you do need to look around a bit for the mana orbs, since you need to regenerate mana fast if you want to keep the shield up.
If you're thinking of statting Attack, don't. You need 193 Stat Points into Luck for 100% crit chance. If you were to invest that in Attack, you'd only get 386 attack, which isn't as effective when you have one of the last 2 weapons equipped.
I never used any Stat Points in Intelligence, since the mana boosters you find around are good enough.
I did use some points into the "HP + Defense" stat, whatever its name was, but that was because I thought Grim would make the zap attack deadlier, which didn't happen.
If you actually struggle with the final boss, simply keep your Shield up, use Screw Attack while trying to stay behind the boss and spam mana potions (You can easily farm them from xenomorphs).
Honestly, Mother Brain was the hardest enemy in the whole game.
Overall, nice game, nice fap, nice sticking around to see Grim finish the game! The man's a beast.