good start
i'd suggest that you make it so the grey ball can't touch the red balls, have multiple levels where you have to survive a certain amount of time or hit a certain amount of red balls. finally, have unlockables. such as giving your ball spikes, turn your ball into a scythe or somethin', exchange the red balls with Bush heads (cause i'd really love to bash those), ect.
Maybe a classic touch
Why not add the pacman effect. Make the player have to avoid the red balls until a powerup is obtained then allow them to eliminate them.
not bad
for a demo, this game is pretty good. the only problem is that it gets kinda redundant after a while, so in the actual games try adding levels or goals or something. overall, this was a pretty good game, even though it was simple. good job, and keep going. you have lots of potential
needs work but idea good
maybe add power ups and add a objective or something to try and comeplete the game for. also u could add more coulers and something new 2 make it unique
Its pretty cool
but it'd be more interesting with a purpose, and things to avoid, and with enimies, an amount of life and some balls that give life.