Unbelievably Charmless
I found this game to be unbelievably charmless, from the graphics, to the mechanics, to the environment.
The graphics are reminiscent of another game, Star Guard, and seem almost mirrored to an alarming point. The levels are extremely bland and boring, allowing no room for curiosity or setting. Are we aboard a spacestation, or in a basement? While mirroring the simplistic style of Star Guard, It lacks the charm that makes it work. I strongly suggest Developing a setting, and using that setting to determine the graphical style and content.
The mechanics are simple run/jump/shoot, which work great in mainly games. They bring forth no creative or intuitive use, which in itself is not totally a bad thing--Many games have these cookie-cut controls and work them fabulously--but for these controls to feel like an extension of your own will, there has to be some enticing graphical and environmental feedback. There's nothing to look at besides what you're controlling essentially, and it's quite boring to be honest.
You attempted some creative mechanics with the wall jump, but it was never fleshed out as something I felt necessary, it was just a clunky movement style that was necessary only because of the level design--no setting for the game means I can't make assumptions, If I were in a jungle I would expect to need to swing a vine, or climb a tree. The wall jumping made me envision this game taking place in a ventilation shaft, and that's all it did for me.
I found the game rather unappealing and undeserving of my time. From the boring environment, to the charmless characters, to the unnatural mechanics.
I find it deserving of a 1/10.