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It obivously needs some polish, but the idea is great. Take some time, improve graphics and the UI and a few more levels and you have a wonderful game.
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Issues:
Too many redundant levels that require the same technigue.
Bouncier balls would be more fun, especially on levels like 21 where it's difficult to get them to ricochet, and they tend to hug each other instead.
Less friction would also make for a zippier game.
More intermediate level design. I found the levels went from nearly obvious solutions to levels requiring difficult timing, without many complicated set-ups to be solved in between.
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Great concept, poor execution.
First off, the UI is poor. The level fade-out is slow, and the design is very Web 0.5. The level design itself is terrible - the first two levels provide a decent difficulty curve, but the third introduces two new 'concepts' at the same time, the fourth is laughably easy and then the fifth is obvious but completely broken.
Try googling 'game theory' and reading a few essays.
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Would be sweet if you had a speed up time button, cause it can get really boring when they are rolling really really slowly!
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for level 21: drop the yellow one when the beam is moving upwards, when the yellow one reaches the brown one release the brown one to kick the yellow one to the left^^