I don't think a large size for an engine is that much of a problem, if the engine has a lot to give. And that might be possible to trim down even more (using strip I suppose).
The problem I found with the game on my phone (Nexus S with CyanogenMod 10.2), is that I can't look and move at the same time. Like it does not support multi-touch, or simply is not intended to work that way. I don't have this problem with other games. Also, it ran only with the fastest setting, but the phone is limited I suppose with the amount of stuff I got installed.
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