Correction: Some of the things are do able, you can shoot and you can get back up, but because there are no instructions you play around with it a bit to realize how to actually do them which just, makes people start out confused, at least me lol, although I still don't know how to shoot although I did it once...

Original Statement: It seems interesting, although it also doesn't seem to work? You don't seem to be able to actually jump onto the platforms after going down them, and doesn't seem to shoot, like a shooter would... and also jumping off, just, basically deletes the player for the round and just renders things undoable and isn't very fun...

wow amazing

Meh, not bad.

I would recommend making the shoot key different but overall fun game,

it kinda works
but there's no objective, need to tell what controls are, WASD is fine, but having WASD and E to shoot is too uncomfortable. fire button should be on the other hand. double jump is just, bizarre, not sure how to describe it. you can't pick up weapons or at least, I can't figure out how to pick them up. walking into them just sends them flying.
it's a start but needs a lot of work, best of luck