The flies does not give much experience, so you don't need to catch them all, I just ignored them mostly myself in further levels. But they are just annoying as real ones, aren't they :)
@TheSambassador:
Actually you just have a half "heart" on the beginning, I ended up forgetting to write something like "My head hurts, I must have been hit, hey this potion could help" on the map, but this is noted for a post-mortem version (would be a "new feature" so I'll not add it in this version for the sake of fairness) as well as better marks for the exit.
The movement is a bit weird but I kept it like this to prevent the player to fight diagonally, this would have made the fights too easy...
@ For all who just get a white/black screen:
If you press enter does it show something different (or do you at least hear you something different) ?
Unfortunately I can not reproduce this bug, so I guess that this is a problem with the graphic card (to be precise incompability with non-power-of-two-textures) and not with the operating system, at least I hope this is it.
If my assumption is right, you should be able to get into the gameplay without seeing the menu (but of course I'll fix this)