This was a big update! I added a play screen, a shop with secondary weapons, lemons wrapping round, smaller lemons speeding up and I fixed a few bugs also. Press numbers 1-6 to change weapon (buy them in the shop first), press space to fire that weapon, WASD keys to move.
Thanks to Griffpatch for making the original Lemonoids game. Strangely enough, I got the weapons from a game called Airfix Dogfighter.