Hey, thanks for the feedback! I also don't like getting out of the bottom right corner, I want to revisit that area and clean up the layout some to make it a bit more enjoyable to backtrack through. You didn't have to use the mouse, I assigned shoot to a number of keys on the keyboard (f and k I believe). I don't normally play on a keyboard so I don't really know what the standard is for attack. Someone suggested I some slight hashing to the tilesets so I'll probably go and try that to improve visual clarity.
The teleporters were linked to their area's sub-generator, so turning off a sub-generator would disable its teleporter. It wasn't until I had everything laid out and was playtesting already that it occurred to me to put the teleporters closer to the end of of each zone so you could use it to get in and then the backtracking only occurs when you're trying to get out of a zone, but alas, there wasn't enough time for iteration in that regard.
Thanks for playing!