not bad, but the game is not fluid.

Not bad for a first game.
However, it's a bit too fast and gives you no chance to recover when you make the slightest mistake. I would at least make the purple enemies take like 1 out of 3 hearts, so that you have a chance to complete the level and don't have to choose between crashing into a pillar and being shot.
In countless of tries, I only got past the three pillars once (they're too close to each other), only to be immediately shot by other enemies.
Also, a pro tip – if your first-person character is a plain old capsule with a floating gun, disable the shadows on the mesh renderer, otherwise, everybody will be able to tell.

waaaaaay too buggy, no tutorial and slippery movement. I'm being lenient since it's your first game