Finally completed the game, winning round takes 6:22:99. I would say the game is quite nice! The game is simple to understand, and doesn't really have too much complexity to it, but for a short game like this, it's perfectly fine. The random power-ups is a nice addition that fits nicely with the theme. Though I think they are a bit unbalanced at times. The 20s speed up is never worth it in my opinion, the ammo trade felt a bit unfair when you got punished while having not enough ammo, and unlimited stamina almost gives you an automatic win. But I guess this is the fun of the game, I suppose.
A minor criticism I think, is that the gun felt a bit off. A lot of times I am pointing straight at 2m range, aiming directly at the body of the spider, yet I somehow missed the shot, let alone shooting long range. There's even a bullet hole on there for god sake. If there is a hidden health bar, it would be nice to show it instead, as it gives feedback to the player on whether they are aiming correctly. Or at least add a hit animation. The reload time is a bit long too, but I guess that's just a skill issue. I would also suggest using something other than a white cube to indicate powerups would be better, as it currently blends right into the white text, making reading a bit hard. Also, a white cube doesn't convey power-up in the imagery.
Anyway, good job making this nice little FPS. I had quite some fun! Keep up the good work!