Use the arrow keys to move, avoid the fast-moving grey squares, and run into the blue Xs to kill them. Don't let the number of Xs reach more than 5, and don't let your square be destroyed. You also grow as you kill more blue Xs. Press R to restart (The counter doesn't work after that, sorry. Better to press the flag)
I made this all today. It's not particularly good, but hey, I never share anything. Oh, and it's pretty hard, in my opinion. (I'm bad at games) Please tell me about any glitches and/or how to fix them, as well as suggestions for this or future projects. 5-20-17: Game shared 5-21-17: Made the square faster and added the restart button 5-22-17: Made better enemy counters 5-23-17: Added score 5-26-17: Added "If on edge. bounce," and faster cloning for blue Xs. (I thought that if I did so well, it wasn't hard enough). Also added gradient to background.