The movement feels fluently even though the controls feels a bit hard for me. The gameplay seems very bug free.
I liked the fact that you move in elevation and that the movement feels generally smooth.
I Like the upgrade system it works well.
The information page in the beginning has alot of text to read and maybe a bit to long, but it does give alot of information that is needed to play the game.
The menu system felt a bit strange to work with, and maybe the keycards should end up on the bottom of the inventory (or somewhere else) since you seem to be used passively.
I ended up using only wasd and spacebar and backspace. Skipping strafe option entirely.
I did die one time in last room. The only time using the 3way shot made sense, but instead I got hit from 3 enemies at the same time and died. Nice death solution and that I didn't need to do it all over from the beginning.
The game would benefit from sounds. The scenery and graphics (not enemies) worked great.
It took me about 35min to complete the game.