Love the different enemies :) difficult to control - ended up off the screen a lot of the time :p but overall a fun game - great job!
is there a bug with the screen wrapping i missed? you should pop out the other side when you travel all the way over.
May have been the screen size I had...? I just loaded it up in a window
did some testing on a few different pc's i have lying around at various resolutions, i can only conclude what you are experiencing is some sort of freak once in a blue moon issue. I can't seem to replicate it myself