Pretty easy little maze game you got here. I managed to get through all the levels!
I noticed there didn't seem to be much of a reason to drop the plasma, so maybe that could be made to be more useful. A few times I placed them to help orientate myself and mark where I had been, but I wasn't sure if that was the intended use. I do wish there was more to do in the mazes other than wandering around until you find keys and switches, like maybe puzzles to solve or things in the dark you have to watch out for. Other than that, nice job!