Not bad.
The game was really fun to play, and I liked using the mouse as your weapon, but the difficulty curve is like running into a brick wall. For the first two floors you have two spawn points of easily killable enemies, but on the next one they are much more hardy and there are four spawn points. If the game was a bit slower with the building up the enemies strength it would be much more fun.
Thanks for the review, you may be onto something here.
I guess I could try to make the curve a bit less steep but not too much so it won't become too boring.
neat, but...
loss of mouse focus issues make this really hard to play the way I'm sure you intended. After losing focus ten or so times I just gave up. It's a real hit on your playability against the background of an otherwise pretty neat game.
Fix it for 3 more stars.
What do you mean by losing mouse focus? Running the mouse outside the screen? I thought that might be a problem but there's not much I can do about on NG.