Short but sweet! I enjoyed myself. It was nice seeing Gina and Sakura again, but Katt is new best girl!
I'll admit I was confused by the return to the ship. I feel dumb, but I played the whole thing without understand why that was happening. Reading the other comments cleared that up. One thing that might have been neat would be updated dialogue on each return. (Ok, maybe there was? I only check Katt once, and assumed the dialogue would not change for the others either. My bad if I missed that!)
The combat and movement was good... I found I mostly relied on magic. Melee usually just meant getting damaged. Thankfully, magic was fun to use, so no problems there!
I saw you mentioned the free-Doom assets... I knew I saw Lost Souls being shot at me!
I enjoyed the ending, that was a nice touch. (The "simulation"... is how I will describe it without spoilers). Looking forward to Shattered 2!