The enemies should get stronger with each coming wave. Right now once you level up damage your invincible. Also it started on wave 2. Still the jump to fix too.

Seems suspiciously a lot like a game I posted the other day (http://love2d.org/forums/viewtopic.php?f=5&t=77549) except worse. The difficulty is entirely based on how fast you can mash your mouse button and the movement is really rather pointless. White isn't a funky colour and doesn't go with ...