I liked how you allowed people to play with whatever button they liked.
I think your enemies are a bit non-intuitive though. When players see a smiling sun-like thing, they're inclined to grab it only to find out it's an enemy.
Some more things to collect/powerups would have been nice too.
I felt the game moved pretty slow though. With how the player was basically only pressing a button every 2-3 seconds. It just felt like a slow version of the helicopter game.
I did have fun though! So props on finishing a nice little game.