Seemed punishingly difficult at first, but once I got the hang of it wasn't so bad. (Unity crashed out for me after the 4th or 5th level, not sure which.)
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Honestly, I can't remember which browser that was. I've been switching back and forth between safari and Firefox on Mac, then over to chrome and Firefox on windows, depending which works for each game. I suspect it was a safari on Mac problem, because that's the config that's giving me the most grief.