I liked this game a lot up until a level that I couldn't beat because I couldn't pull two directions from the stack in one cycle, which made it impossible (I think, or I might not be smart enough). The mechanic suffers from both having to be slow as not to be too hard, but also fast so you don't have to wait forever. If you plan on fleshing the game out further (which I think you should), I really recommend not making the levels larger than they absolutely have to. keep it up!
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Thanks for the feedback! You're quite right about the too slow/too fast thing...
About not being able to pull two directions on the same turn: it's part of the puzzle! You'd probably have to plan to have the right stack at the right time.
If a level is too hard though, you can still skip it by pressing 'P'!