I think the draw is pretty lousy... Maybe starting with 2-3 cards and capping the amount you can get at 7-9? The first move should really be a strategic decision and now it's more like a gamble.
Maybe choosing between: get 1 card each turn or discard 1 randomly and two cards.
Just throwing ideas, but now it feels weird.
Great game, I might buy it on Ipad if there are more levels.
Also consider adding timed challenges or fewest moves possible challenges. Maybe even levels where the totals must all be different.
Don't hesitate to ramp up the difficulty, some people love hard puzzles!
Took 24 levels to understand how to slow the time :-o
Also, Atropos 1 is doable. The trick for the last move of the phase 2 is to slow time, stand still for a bit then jump out of the hole created by your anti-bullet lazer. I managed not to get hit during that phase once ^^