i'd say make it so space bar also drops a ball. having to click the mouse all the time is murder on your arm. also like someone else was saying adding an idle mechanic that drops a ball automatically every few seconds that you can upgrade over time would be a nice addition.
I really like this game. Some people complain about the energy system, but really I like it as it stops me from merely sitting here playing this, and I can take a break doing something else before returning. It has a way of lengthening the game as you can't go through it as fast as maybe you would without the energy bar. This game really is excellent! :)
Difficult game! The only thing I would request is checkpoints for the longer levels, like the rising lava one. It really sucks to have to start all the way from the beginning. Other than that, the game seems pretty good altogether. Keep it up! 5/5 :)
FIXED.
the LAVA level and the final level (one of the longest) have checkpoints now.. the other levels are pretty short or safe (no reasons or circumstances to die there :) )
 "Immense Army"){kind=icon}
 "PlinkyPlinky!"){kind=icon}
 "Ragdoll Ball"){kind=icon}
 "ir/rational Redux"){kind=icon}
 "My Pet Protector 3"){kind=icon}
 "Zomboz 2"){kind=icon}
 "Alxemy"){kind=icon}
 "Fancy Pants Adventure: World 3"){kind=icon}
 "Super SOPA Bros."){kind=icon}
 "Clash of the Dragons"){kind=icon}
 "A Game About Game Literacy"){kind=icon}
 "WarLight"){kind=icon}
 "Cave puzzles: a gift"){kind=icon}
 "Doodle God"){kind=icon}
I like the spacebar idea - I'll add that when I update the game. Thanks!