The game is quite fun, however i do think games like these definitely require music and sound effects more than others. The effects are all great, slowing down makes you a bit more paranoid which is quite a good effect for this, but the cherry on the cake has to go to the flipping of the screen and controls. That took some time to get used to and even then it was hard.
The level design looks good, it could use some tweaks, a few platforms to run onto and jump would be nice, and maybe even disappearing platforms.
All in all its fun, but i do think music should do some or most of the work here.