First, I'll mention the game has spelling mistakes and then not mention it again since I don't think it's important. Some of them are pretty distracting though (like the Colonel saying 'extradimentional' right in the prologue). There's also some missing periods and other stuff that can be fixed by proof-reading.
The art is still very simple, and that's fine; that being said, I don't like the palette. At some point I thought a red bridge was a door. Maybe that's more due to the lack of shading, but it's not very nice to look at. The lack of music made me feel lonely. There's a severe lack of responsive SFX. I loved the portraits, they're very cute; the dialogue is very cute and fun, and the story is easy to understand.
Right after I started the game, I accidentally skipped the tutorial by walking on the teleport pad (probably shouldn't happen). When I went back to the prologue, I found out you can't skip the dialogue (not good). As to the gameplay itself, it's fun: I got lost sometimes, but that's more a level design question than a fault in itself. The level design, as it is, seems like a mix of Zelda-like dungeon crawler and typical top down shooter (I think that's the intention). At some point I accidentally teleported again and got lost (again, probably shouldn't happen). The Rumia boss fight was fun, but I feel like her hitbox is way too small. The red cross-hair is also too small and easy to miss; I couldn't really tell where I was shooting. You could either make it bigger, make the color stand out more, or make it follow the cursor, or maybe a mix of those, whichever you find better considering the gameplay. I think you should also be able to manually move the camera somehow, even if just a little bit off the edge of the screen, since vision is pretty important in these kinds of games.
I think some concepts could be explained better. It took a while for me to realize the laser used your shield, and that grazing replenished it, although I might have missed some explanations, since I tend to get lost while reading.
I found one bug at some point, with the red elevator, where if you stood next to the button and pressed it would push you up or down as if you're moved by a mysterious force, even though you're not actually standing on the elevator itself. I found another bug, in the section with the remotely-controlled turret, where it would go through the door leading into the room even though it's closed; apparently the turret doesn't have collision there. Otherwise, it seems pretty bug-free. I liked this game, keep it up.